Head-to-head · Best Smartwatches

Apple Watch Ultra 2 vs OnePlus Watch 3

Which is the better buy? Side-by-side on rating, price, strengths, and watch-outs — with the published ratings we averaged to get there.

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The short answer

Apple Watch Ultra 2 comes out ahead by a narrow margin (4.4 vs 4.3). The gap is mostly about iPhone owners who train or work outdoors and can charge every day. — read the strengths below before deciding.

Higher ratedRanked #1 in Best Smartwatches

Apple Watch Ultra 2

4.4

4 sources$729.96as of Jul 31

The Ultra 2 is Apple's rugged watch: a titanium case to MIL-STD 810H, 100 meters of water resistance, dual-frequency GPS and a programmable Action Button with a siren. PCMag rated it 4 out of 5 and singled out the display, which peaks at 3,000 nits. OutdoorGearLab scored it 4.6 overall but 4.2 on battery — about 36 hours of ordinary use, and roughly 12 hours with GPS running.

Strengths

— MIL-STD 810H certified for rugged durability
— Flat display design for enhanced protection
— Action Button offers customizable functionality and emergency siren

Watch-outs

— Roughly 12 hours of battery with GPS running, far short of dedicated endurance watches
— Full navigation still depends on a paired iPhone
— The 49 mm titanium case is large and heavy on a small wrist

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Ranked #4 in Best Smartwatches

OnePlus Watch 3

4.3

4 sources

Battery life carries the OnePlus Watch 3: a 500 mAh cell plus a dual-engine architecture makes it one of the most reliable Wear OS watches you can buy. CNET praised the endurance, and GSMArena pointed to the MIL-STD-810H certification and IP68 rating behind its durable design. The 1.5-inch LTPO AMOLED display is bright and sharp. Reviewers were less pleased with a charging cradle that has to be lined up just right and with subpar audio during calls. Buy it for the battery and the build; look elsewhere if you need eSIM or better call quality.

Strengths

— Impressive battery life with 23% increase in capacity to 500 mAh
— Durable build with MIL-STD-810H certification and IP68/5ATM ratings
— Large 1.5-inch LTPO AMOLED display with 466x466px resolution and 2,200 nits brightness

Watch-outs

— Charging cradle requires precise alignment
— Sound quality during calls is tinny with average microphone performance
— No eSIM support despite Bluetooth and Wi-Fi connectivity

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How they stack up

Apple Watch Ultra 2

Against a Garmin Fenix 8 the Ultra 2 loses badly on endurance and wins on software, notifications and everything that follows from being an Apple Watch. Against the Series models it buys ruggedness, a brighter screen and the Action Button for a lot more money. It is only worth considering for someone already carrying an iPhone.

OnePlus Watch 3

The OnePlus Watch 3 excels in battery life and durability, surpassing the Apple Watch Series 11 and Apple Watch SE in both areas, but it lacks the advanced health sensors and app ecosystem of Apple's offerings. Compared to the Garmin Venu 3, it offers better display resolution and a more comfortable fit, though it doesn't match the Garmin's sleep tracking or third-party app support. It's a strong contender for users who prioritize endurance and build quality over smart features.

Specs side-by-side

Spec	Apple Watch Ultra 2	OnePlus Watch 3
Display	Flat	1.5 inches LTPO AMOLED
Processor	S9 System in Package (SiP)	Snapdragon W5 and BES2800 BP
Battery	Up to 36 hours of normal use	—
Water Resistance	100 meters	IP68/5ATM
Connectivity	LTE, UMTS, Wi-Fi 4, Bluetooth 5.3	Bluetooth and Wi-Fi
Health Features	ECG, heart rate monitoring, and blood oxygen saturation	heart rate, and temperature sensor
Weight	61.4g	49.7g
Dimensions	1.93 x 1.73 x 0.47 in	—

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