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There is a YouTube channel named "The Quantified Scientist" which offers technical and more in-depth reviews of varied fitness trackers: https://www.youtube.com/@TheQuantifiedScientist. I would very much recommend it if you intend to buy a wearable and care about accuracy

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I love his channel. The TL;DR of it is that Apple Watch generally has the best overall health accuracy when compared to other wearables.

Other data point: he wears the Whoop as his daily wearable.

For the top quintile of gadgets, accuracy isn't what sets them apart but rather everything else (battery life, UI, data presentation, form factor, etc).

That depends on what you're looking for. Apple Watch has a pretty good optical heart rate sensor but it's not great. Everyone knows that if you want accurate heart rate data you need to use a chest strap.

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