Oura vs Whoop

[Hildabaggins]

Has anyone tried either of these? I have heard both recommended on podcasts as ways to improve your general health by tracking your sleep, heart rate, fitness etc but are they really that useful or are they a gimmick?

Can you buy them second hand or would they still have the previous persons info stored on them?

im currently looking at an oura as ive had a couple of recommendations from people, especially for sleep tracking.

i don't know about whoop. i think they serve their purpose for full service tracking. ive seen a few oura on vinted as well, you can measure your finger in John lewis

It’s the sleep tracking I really want it for. I want to see how alcohol, caffeine, sugar, exercise etc affect my sleep.