Best Fitness Tracker for a Soccer Player who also goes to the Gym.

Hello guys, I don't know if this is the right community or not for this, but I am a 19 year old soccer player who really wants an accurate fitness tracker, which gives you the correct amount of calories burned, step count, and HRV. I was previously with WHOOP, and I found it to be a pretty good fitness tracker specifically for my needs. The reason I'm considering other options is because the whoops calorie tracker is widely deemed as inaccurate, and another one of my concerns is that you're unable to sync data with calorie tracker apps. I want a device which prioritizes these concerns. I don't know if I should stick with whoop, or find another device.