What data are you hoping to get out of the device?
None of these devices are medically suitable to get reliable enough results. They are best used for trends and basing your decision in the value above or below a baseline, together with Feel.
If you want better control of your health then the 3 best things for you (apart from avoiding stressful situations) are good nutrition, enough sleep and exercise.
You know what good food is and you know how much sleep you get without a nighttime wearable like these.
Exercise / Training is another thing though and tracking your HRV can be of huge benefit. But to do this all you need is a HR monitor capable (Polar H7, H9, H10 etc) and an app like Elite HRV, HRV4Training. iTtlete etc. These give a more reliable HRV reading because you have almost total control over the repeatability of the readings each morning. You do not have this repeatability with Whoop or Oura because they rely on you being in a certain stage of sleep for a certain time length. This might be at different times each night. Your arm / body will most likely be in a different position each night also when the info is recorded.
Save yourself the money and just use a Polar or similar instead. Eat well and get enough sleep. Avoid people or things that stress you out. And don’t worry any more about it
OK, fair enough. But it’s no more accurate than a Polar H9 and a free app!!
The other thing I don’t like about these sleep monitors is that it’s almost like a self-fulfulling prophecy. These apps tell you that you haven’t slept well or aren’t sleeping well or don’t get enough sleep. So then you start to stress about not getting enough sleep and hey presto, what do you know, you can’t get to sleep because you’re thinking about trying to get to sleep
Do we really need to pay hundreds of dollars a year for a Whoop to tell us we need an extra 30 minutes sleep? I don’t know how much an Oura costs. It might be cheaper.