Privacy has become a very important issue in modern society, with companies and governments constantly abusing their power, more and more people are waking up to the importance of digital privacy.
In this community everyone is welcome to post links and discuss topics related to privacy.
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Not a dumb question. Personally, I would recommend the most current version of Bluetooth you can and update your phone (if that's what you're using). Emerging versions are Bluetooth 5.4 and 6.0 and they're backwards-compatible. Thus, they'll fallback to the lowest version supported by both devices.
EDIT: Here's the section on Bluetooth security:
I think there's 2 potential issues with earbuds, the Bluetooth connection itself and/or a pairing app for the buds.
As for the Bluetooth connection, I've never read about security concerns. I don't think recent versions of Bluetooth are at risk of leaking data. They might be somewhat leaky in metadata (which devices are sending signals at all).
The pairing app poses imo a larger risk. These apps are usually proprietary and might be trying hard to get information. That's a risk with any app that requests many permissions, though. A simple solution would be to not use the pairing app. Or you might look into compatibility of your device with Gadgetbridge, which is open source. https://gadgetbridge.org/
Galaxy Buds = privacy hell.
If you want to change settings (like a better equalization),
the app needs almost all privileges (like SMS, phone, location, notifications, etc.)
and it doesn't work with 3rd party ROMs.