
Oppo
A week-long-battery budget smartwatch

Samsung
Samsung's rugged adventure flagship for Android
Oppo Watch S
Oppo Watch S
Oppo Watch S
The Oppo Watch S's headline is how little there is of it — a round ~45mm watch just 8.9mm thick and around 35g without the strap, built around a stainless-steel mid-frame. Reviewers say it nearly disappears on the wrist.
Samsung Galaxy Watch Ultra
47mm titanium case with a cushion (squircle) shape. Customizable orange Quick Button + two buttons. The most durable, most rugged-looking Galaxy Watch — and the most Apple-Watch-Ultra-like.
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Samsung Galaxy Watch Ultra
Samsung Galaxy Watch Ultra
Oppo Watch S
A 1.46-inch round AMOLED at 464 x 464 (317 ppi). It can hit a brilliant 3,000-nit peak — but only automatically, in Oppo's workout modes under strong sunlight. In everyday use it's capped at 600 nits, with a 1,500-nit high-brightness mode.
Samsung Galaxy Watch Ultra
Super AMOLED with Sapphire Crystal, 3,000 nits peak brightness — the brightest Galaxy Watch display. Always-on, with a red Night Mode for low-light readability.
Oppo Watch S
For a budget watch the Oppo Watch S carries a serious sensor array — an 8-channel optical heart-rate sensor, a 16-channel SpO2 sensor, ECG electrodes and a skin-temperature sensor — anchored by a 60-second check that reads around 14 health indicators at once. ECG availability depends on regional certification.
Samsung Galaxy Watch Ultra
BioActive sensor — optical HR, ECG, BIA body composition, skin temperature, AGEs Index. DC Rainmaker found GPS very accurate; flagged Samsung HRV as out of alignment with other wearables.
Oppo Watch S
The Oppo Watch S covers 100+ workout modes with built-in GPS and an AI sports coach that gauges readiness from HRV and recent training load. It's a capable everyday fitness tracker — though there's little independent accuracy testing to confirm how it stacks up.
Samsung Galaxy Watch Ultra
100+ workout modes, dual-frequency GPS, multisport mode, Energy Score, Race feature. Strong for an Android smartwatch; serious athletes still lean Garmin for training depth.
Oppo Watch S
The Oppo Watch S's strongest card. Oppo rates the 330mAh battery at up to 10 days maximum, 7 days typical and about 4 days with the always-on display on — and fast charging adds a full day in 10 minutes, with a complete charge in roughly 75-90 minutes.
Samsung Galaxy Watch Ultra
590mAh battery — the largest in any Galaxy Watch. Up to ~60 hours typical use, ~100 hours in power-saving mode. Wireless fast charging. DC Rainmaker says it beats Apple's real-world battery.
Oppo Watch S
The Oppo Watch S runs ColorOS Watch 7.1 on a power-efficient BES2800BP chip with 4GB of storage — not Wear OS. That choice is the reason the battery lasts a week, but it also means no Google Play app store and a simpler, more limited software experience.
Samsung Galaxy Watch Ultra
Wear OS 5 + One UI 6 Watch + Galaxy AI. Full Wear OS app access, Samsung Health, Samsung Pay + Google Wallet. Best inside the Samsung phone ecosystem. Android-only.
Oppo Watch S
The Oppo Watch S is rated 5 ATM plus IP68 (and IP69), with Splash Touch that keeps the screen usable when wet. It's fine for swimming and everyday water — but Oppo specifically warns against hot showers, saunas and diving.
Samsung Galaxy Watch Ultra
Titanium case + Sapphire Crystal + 10 ATM water resistance + IP68 + MIL-STD-810H. Built for genuine adventure and underwater use.
Oppo Watch S
Built-in GPS, Bluetooth, Wi-Fi and NFC cover the everyday essentials. There's no cellular model, so the Oppo Watch S relies on a paired phone for connectivity.
Samsung Galaxy Watch Ultra
Dual-frequency GPS, LTE built in, NFC for Samsung Pay + Google Wallet, Bluetooth, Wi-Fi. Emergency siren for safety.
Oppo Watch S
The Oppo Watch S launched at around $399 NZD (roughly $230 USD) and is not officially sold in the US. For the price it's a strong value — week-long battery, ECG, a premium-feeling build — as long as you accept the simpler ColorOS platform.
Samsung Galaxy Watch Ultra
$649 launch. Samsung's rugged flagship — competes with the Apple Watch Ultra (different platform) and Garmin. The longest-lasting, most durable Wear OS watch.