https://www.techradar.com/news/apple-watch-4-what-we-want-to-see

Update: Reports suggest the Apple Watch 4 might have a far more advanced way of monitoring your heart and its antenna could be more reliable and resilient.

The Apple Watch 3 is the best wearable Apple has built, and, as it tops our best smartwatch list, it’s arguably the best smartwatch from any manufacturer.