The Galaxy Watch 4 (left) and Galaxy Watch 4 Classic (right) look sharp. And they're running a whole new Google-Samsung OS.

There's one clear go-to smartwatch for iOS: the Apple Watch. But for Android, there hasn't been a singular option. Will the Samsung Galaxy Watch 4 finally be that watch? At Samsung's newest folding-phone-focused Unpacked announcement where the latest Galaxy Z Fold 3 and Z Flip 3 phones were unveiled, the company also announced the Galaxy Watch 4 and Watch 4 Classic -- which can be preordered now and go on sale Aug. 27. I'm already starting to wear them and test them. They're the first Samsung watches to have the Google co-designed Wear OS 3, which isn't coming to other smartwatches until next year. Following the already-excellent Watch Active 3, will the Galaxy Watch 4 be even better? It certainly looks like it.

Much like previous Samsung watches, there are two designs: a sleeker, less expensive Watch 4 and a more traditional-looking Watch 4 Classic. The latter brings back Samsung's physically rotating outer bezel and has more traditional watch-like looks and straps. The prices ramp up based on either design ($250 for the aluminum 40mm Watch 4, $350 for the stainless steel 42mm Watch 4 Classic), size (the larger 44mm Watch 4/46mm Watch 4 Classic cost an extra $30) or LTE data compatibility (an extra $50 on top of that). In the UK, the Watch 4 starts at £249, and the Classic at £349. Australian prices are TBD.

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The Galaxy Watch 4 is only made for Android phones, with no plans for iOS compatibility right now. While previous Wear OS and Samsung watches could pair with iPhones, the Watch 4 is clearly made to be a seamlessly connecting watch for Android (and specifically Samsung) phones. Samsung's is about syncing wallpapers, designs and settings across phone and watch. Will the watch feel like a seamless extension of the phone? We'll see when we test-drive one.

The new array includes electrical bioimpedance, which promises scale-like body fat/BMI estimates.

Drew Evans/CNET

Health tech: Snore detection and bioimpedance-based body analysis

There are several new health features on the Watch 4 on top of the ones that carried over from the . Besides heart rate, blood oxygen and electrocardiogram (and stress-sensing/blood pressure testing that requires calibration with a blood pressure cuff), Samsung is adding a few extras to sleep tracking. Snore detection works using the paired Android phone's microphone, and the blood oxygen checks now run continuously once a minute overnight (or as a spot-check during the day).