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I've never used either, and I imagine the "better" depends on how you'll use it and if it has the features you want. Here are a couple of articles comparing the two, that you might find helpful in making your determination:
https://www.cnet.com/how-to/apple-watch-3-vs-fitbit-versa-best-smartwatch-fitness-tracker-comparison/
https://www.imore.com/fitbit-versa-vs-apple-watch
?
Something that does not distract you