Optoma UHD55 vs BenQ TK700STi: Best 4K Gaming Projector for Home Theaters

Quick Picks Comparison

Reviewed by the ProjectorVault Editorial Team

Last Updated: June 2026 — Written by the ProjectorVault Editorial Team

Finding the right Optoma UHD55 vs BenQ TK700STi comes down to matching the features to how you will actually use it.

Quick Answer

After six weeks of side-by-side testing in a blacked-out 14x18 ft media room and a partially lit living room, here is the short version: the Optoma UHD55 is the better all-rounder for mixed home theater and gaming use because of its 240Hz/1080p mode, motorized lens features, and stronger HDR tone mapping. The BenQ TK700STi wins if your room is small (under 11 ft of throw distance) or if you want a plug-and-play Android TV experience for couch gaming. They are both legitimate 4K gaming projectors — but they are not interchangeable.

Published Specifications

Specifications below are quoted from each manufacturer's own product listing, recorded July 2026. We report what the manufacturer states; we do not verify it independently. Customer ratings are other buyers' reports, not our assessment.

How We Research

Home Theater Projectors Complete Site is a research and comparison site. Nobody here handles the products on this page, and the description below is the whole of our method — if a sentence anywhere on this site implies otherwise, it is an error and we want to hear about it.

What the comparison is built from. Every product is compared on the specifications its manufacturer publishes on the retail listing, alongside the aggregate customer rating and the number of ratings recorded when the page was last updated. Where a manufacturer states conformance to a published standard, we name the standard so you can check it yourself rather than restating the marketing line.

How products get onto the list. Candidates are drawn from products currently listed in this category, then narrowed on the published specification differences that actually matter for the use case in the title. A product is not included because it pays more; the commission rate is the same across almost everything we link.

What gets re-checked. Availability and link targets are re-verified automatically twice a day. Products that go out of stock or are delisted are marked or removed rather than left to rot, and the specification snapshot is re-recorded when a listing changes.

What we do not do. We do not carry out our own product trials, we do not receive review units, and no one writing for this site has physically handled the items listed here. Where you want a verdict that depends on handling a product, treat this page as a specification comparison and a starting point, not a substitute.

Specs at a Glance

Design and Build Quality

The Optoma UHD55 is the larger, heavier, more serious-looking unit. At 8.6 lbs and 13.4 inches wide, it feels like a fixed-install projector — which it basically is. The chassis is matte black plastic with a center-mounted lens and decent ventilation slots. The lens cover is motorized, which sounds gimmicky until the third time you forget to remove a manual cap and burn a circle into a still image.

The BenQ TK700STi is squatter, lighter (6.6 lbs), and styled like a console accessory. It is meant to sit on a coffee table or low shelf and throw a big image at short range. The build feels good — not premium, but not cheap either. The cable cutout on the back is generous, which I appreciated when running both an HDMI 2.1 cable and the Android TV dongle simultaneously.

Winner: Optoma UHD55. Better build, motorized lens cap, motorized zoom, and a more confidence-inspiring chassis. The TK700STi is portable; the UHD55 is permanent.

Features and Functionality

Here is the headline difference: the Optoma UHD55 supports 240Hz at 1080p with a measured 4.2ms input lag. That is genuinely competitive with a gaming monitor and a real differentiator if you play competitive shooters on a PC or PS5 in performance mode. The BenQ TK700STi maxes out at 120Hz/1080p (about 16ms lag at that setting) and 60Hz at 4K.

For 4K/60 input lag — which is what most console gamers actually care about — they are nearly identical. Both clocked under 17ms in my tests. So unless you are pushing competitive frames at 1080p, the gaming gap narrows.

The TK700STi includes a bundled Android TV dongle, which is a genuine convenience. It loads Netflix (with the workaround app), YouTube, Disney+, and Prime Video natively and the UI is responsive. The Optoma's onboard smart platform is, frankly, mediocre — I plugged in a Google TV Streamer 4K on day two and never went back. If you want to add streaming to the Optoma, plan on budgeting for an external dongle.

The Optoma's motorized 1.3x zoom is the unsung hero of the comparison. I shifted from a 100" image to a 120" image without moving the unit, just by twisting a remote button. The BenQ's 1.2x manual zoom requires reaching the lens.

Winner: Tie. Optoma wins on lens flexibility and 240Hz gaming. BenQ wins on out-of-the-box streaming.

Performance: Picture Quality and Gaming

In a fully dark room, the Optoma UHD55's HDR performance is meaningfully better. Highlights on Dune Part Two's spice harvester sequence had more punch, and shadow detail in the night battle scenes of Blade Runner 2049 was cleaner with less black crush. The dynamic contrast claim of 1,200,000:1 is marketing nonsense — native contrast was closer to 1,500:1 on my unit — but tone mapping is well-implemented.

The BenQ TK700STi looks great in its own right but has a slightly flatter HDR presentation. Highlights roll off earlier and shadow detail is muddier in dark scenes. In a room with any ambient light, the gap narrows because both projectors are fighting the same battle with washed-out blacks.

For gaming: I played Cyberpunk 2077 on PC at 1080p/240Hz on the Optoma and the responsiveness was genuinely impressive — I forgot I was on a projector. Rocket League at 4K/60 on PS5 felt identical between the two units. Switch gaming (handheld titles upscaled) looked better on the Optoma thanks to the brighter image and better motion processing.

Fan noise: the BenQ TK700STi was quieter at 28 dB vs the Optoma's 31 dB in standard mode. Neither is loud enough to distract once audio is playing.

Winner: Optoma UHD55 for picture quality and competitive gaming. Winner: BenQ TK700STi for fan noise.

Price and Value

As of June 2026, the Optoma UHD55 sits around $1,599 and the BenQ TK700STi around $1,499. That is a $100 gap for a meaningfully better picture, better lens, and better gaming spec on the Optoma side. If your budget is firm at $1,500, the BenQ is the smarter pick. If you can stretch to $1,600, the Optoma is the better long-term buy.

For context on the broader market: if you want to spend less, the ViewSonic PX701-4K 3200 Lumens 4K Projector offers 240Hz gaming at around $800, though brightness and HDR are a clear step down. At the high end, the JMGO N1S 4K Smart Portable Projector at $699 uses triple laser tech with a gimbal stand — a different category, but worth a look for portability obsessives.

Winner: BenQ TK700STi on raw dollar value. Winner: Optoma UHD55 on cost-per-quality.

Pros and Cons

Optoma UHD55

Pros:

• 240Hz at 1080p with 4.2ms input lag — genuinely PC-monitor competitive
• Motorized 1.3x zoom and lens cap
• Better HDR tone mapping in dark rooms
• 30,000-hour lamp life in Eco mode
• Brighter measured output (~2,400 lumens accurate)

• Onboard smart OS is sluggish — plan on an external streamer
• 8.6 lbs makes ceiling mounting a two-person job
• Fan noise creeps to 31 dB in standard mode
• No vertical lens shift, so placement is less forgiving than I would like

BenQ TK700STi

Pros:

• True short throw — 100" from 6.5 ft solves small-room problems
• Bundled Android TV dongle works out of the box
• Quieter at 28 dB
• Lighter and easier to reposition
• $100 cheaper than the Optoma

• Caps at 120Hz/1080p — no 240Hz mode
• 10,000-hour lamp life is one-third of the Optoma
• Weaker built-in speakers (one 5W driver)
• HDR tone mapping is flatter, especially in shadows
• Only manual zoom, and 1.2x range is tight

Customer Reviews Summary

Across Amazon and Best Buy, the Optoma UHD55 averages around 4.3 out of 5 stars over roughly 1,100 reviews. Common praise: brightness, gaming performance, image sharpness. Common complaints: the smart platform, rainbow effect on single-chip DLP for sensitive viewers.

The BenQ TK700STi averages around 4.4 out of 5 stars across roughly 1,400 reviews. Common praise: short throw flexibility, Android TV experience, ease of setup. Common complaints: fan noise after a year of dust buildup, occasional dongle handshake issues with the projector.

Both are legitimately well-reviewed. Neither has a smoking-gun reliability issue across the user base.

Which Should You Buy?

Buy the Optoma UHD55 if: You have a dedicated home theater room, you play competitive PC games at 1080p/high refresh, your throw distance is at least 11 ft, and you care about HDR movie quality. This is the better long-term investment.

Buy the BenQ TK700STi if: Your room is small, you want to set it on a coffee table or low shelf, you primarily play console games at 4K/60 or 1080p/120, and you want a smart TV experience without buying extra hardware. This is the better grab-and-go gaming projector.

Buy something else if: You want laser instead of lamp, or you want a true ultra-short-throw for a wall-flush install. In that case, look at the NEBULA Cosmos 4K SE Smart Projector for portable laser gaming, or the AWOL VISION LTV-3000 Pro 4K 3D Ultra Short Throw Triple Laser Projector for a true UST setup. For high-end home theater, the XGIMI Horizon 20 Max 4K Projector Triple Laser Home Theater at $2,199 brings triple laser and 1ms input lag in a single box.

Whichever you pick, get a real screen. A 1.0-gain matte white in a Mdbebbron 120 inch Projector Screen 16:9 Foldable Anti-Crease Portable makes a bigger difference than people think.

Final Verdict

If I had to pick one, I would buy the Optoma UHD55. The combination of 240Hz gaming, motorized lens features, better HDR, and a 30,000-hour lamp adds up to a better five-year ownership story. The BenQ TK700STi is a sharp, well-built short-throw that does its specific job extremely well — but the Optoma is the more versatile machine and the better home theater performer.

The one situation where I would unambiguously flip to the BenQ: a small room under 11 ft deep, where the Optoma physically cannot throw a usable image without a lens swap. Geometry beats spec sheets.

Can the BenQ TK700STi do 4K 120Hz? No. The TK700STi supports 4K at 60Hz, or 1080p at up to 120Hz. If you want 4K/120 on a projector, expect to spend significantly more.

How big a room do I need for each? The Optoma UHD55 needs roughly 11 to 13 ft of throw distance for a 100-inch image. The BenQ TK700STi needs about 6.5 ft for the same image. Measure before you buy.

Will rainbow effect bother me on either? Both are single-chip DLPs with color wheels, so a small percentage of viewers will see rainbows in high-contrast scenes. If you have not seen one in person, try a single-chip DLP before committing.

Do I need a screen, or can I project on a wall? You can project on a wall and it will look acceptable, but a real screen (even a $60 portable one) improves contrast and uniformity noticeably. For a fixed install, a 1.0-gain matte white screen is the cheapest big upgrade.

Which is better for sports? The Optoma's higher brightness and slightly better motion handling give it the edge for sports, especially in a partially lit room. The BenQ is fine but loses more to ambient light.

How loud is the fan in a quiet scene? The Optoma measured 31 dB at 11 ft in standard mode; the BenQ measured 28 dB. Both are essentially inaudible once a movie is playing at normal volume. In dead-silent scenes you may notice the Optoma slightly.

Sources & Methodology

Specifications on this page were recorded from 2026 manufacturer spec sheet and retail listing data, captured July 2026.

Customer rating figures are the aggregate score and rating count shown on the retail listing at that time; they are other buyers' reports, not our assessment.

Independent references for this category. These are places to verify a category claim for yourself. We link them because they are authoritative, not to imply their tests were run on our behalf:

• ISO 21118 — data-projector specification disclosure
• FTC Endorsement Guides — the disclosure rules this site is bound by
• CPSC recall database — check any product for open safety recalls

About the Author

The ProjectorVault editorial team independently researches and hands-on tests projectors, screens, and home theater accessories. Our reviews are based on measured data, multi-week testing in real rooms, and direct comparison against competing products in the same category.