No, the Apple Watch is basically best of breed in terms of sleep and heart rate accuracy.

The Whoop is like 90% accurate compared to it: https://www.youtube.com/watch?v=9SzUDTBK-i0

It's just trade-offs: if you're using the Whoop, you don't want a screen and you like two weeks battery life.

There’s a study that pitted different devices against each other. The whoop was more accurate. At least a few years ago it was