What is more reliable? Sonar or Connected Galaxy Active Watch

Hello, I was wondering if anyone had any experience. I used sonar last night for the first time and it seemed to work pretty well. I am still trying to learn how to read the damn graphs. Would the sleep tracker be more accurate if I used a galaxy active watch or would just using sonar be better?

I would love to know too. Using a Garmin here.

I’m interested to know too! Using Samsung Active watch!