to sell them, next to none of them are actually backed by science, more so backed my online influencers for clicks, subscribers and sponsors.
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But the (much cheaper) Fitbit Sense 2 seemed much more accurate and can detect Afib. For example, the Fitbit records sleep as duration less time awake; the Garmin says I’m asleep pretty much the entire night, so wildly overestimated.
None of these are accurate compared to sleep measurements that are using brain wave, oxygen, and other sensors. They are doing a lot of guessing based on body movement and heart rate. I had a Fitbit before my Garmin, and the Fitbit did seem to do way better and detecting awake time. But I took deep sleep and REM with a grain of salt.
Where the tools work well enough is the overall sleep score. Garmin is definitely a lot stingier than Fitbit. But, in a relative sense, when Garmin gives me a 60, I know I had bad sleep. And when I make lifestyle adjustments before bedtime, and Garmin gives me an 80, I know I had much better sleep and the changes worked. Both are relatively equal in that regard.
Yes I accept these are estimates and I get the point that it’s relative change which is most informative, rather than absolute values but they do seem wildly different. The highest I’ve had with Garmin is 55, so maybe I need to ignore it.
That is super low. My Garmin scores have been about 10 to 15 points lower than what I got with Fitbit. A max of 55 is wildly different from my experience. When I see a 55 with Garmin, I had a rough night of sleep. Good nights for me are in the high 70s to low 80s.