Privacy on Smart Watches

I want to buy a smart watch for me to record my health stats and I want to see the history like for a year. I want to buy something cheap but I am thinking about privacy issues. Would it be safe to buy a Xiaomi smartwatch then use GadgetBridge as the app to view my stats? If not, what do you recommend to do? Thank you!

EDIT: So yeah, Xiaomi is not recommended. What is the best option to …

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