Which Apple Watch Should You Buy?

This latest version of the classic Apple Watch model—which our testers are busy evaluating in CR’s labs now—isn’t all that different from the Series 9 model that came before it. But it does have some noteworthy upgrades.

The case is offered in the same two sizes, 45 mm and 41 mm, but the display is a bit bigger than in the Series 9. It’s also a bit brighter when viewed at an angle. You have the option of an aluminum case or, for the first time, a premium-priced titanium case, both offered in a few different colors. The watch is also thinner and lighter, making it potentially more comfortable to wear all day, including to bed.

No matter the size or display type you choose, expect a top-tier smartwatch that’s equipped with all the important functionality that matters to a typical smartwatch user, like sleep tracking, heart rate monitoring, and tap-to-pay.

Unlike the Watch SE, the Series 10 offers an Always On Display option—handy for when you want to simply glance down to get the time—as well as the Double Tap gesture.

The Series 10 also comes equipped with the latest S10 processor, but there’s no change in claimed battery life from the last generation. You can expect up to 18 hours of power per charge or up to 36 hours in low-power mode, Apple says. (This is the same as the Watch SE but a bit less than the Ultra 2.) It does get a boost in charging speed, though, according to Apple. The Series 10 can now charge up to 80 percent in just 30 minutes, which could better accommodate all-day and all-night wear.

The health tracking is robust. Notably, the Series 10 features body temperature sensors for more accurate cycle tracking and retrospective estimates of ovulation, a high-g-force sensor for car crash detection, and ECG functionality to detect unusual heart rhythms. It also comes with new sleep apnea detection through the monitoring of nightly breathing disturbances. (The Watch SE doesn’t have these features, but the Ultra 2 does.) The blood oxygen sensor on the Series 10 is not currently enabled, as with the Series 9 and Ultra 2, due to an ongoing patent dispute.

We don’t have official ratings for the Series 10 just yet. But overall, you can expect it to do everything a high-performing smartwatch does—and do it well—though you’ll lose a few of the shiniest bells and whistles available on the Ultra line. Check back soon for our official test results or take a deeper-dive into our first impressions.