I bought my Apple Watch mostly for gathering health metrics. It's great for that, but I would very much like the option of a ring-based sensor -- especially when sleeping. The Oura is unfortunately a subscription product, and it seems like Samsung's offerings don't really play with Apple very well. I'm hoping that Apple puts out their own ring wearable at some point. It wouldn't replace my Apple Watch, but I'd like to have the flexibility to go out wearing a regular wristwatch sometimes, and to gather sleep data without wearing anything on my wrist.