If you don’t use sideloaded apps or lean heavily on the voice assistant you lose nothing in the transition, it’s just going to take a brief adjustment period getting used to the new OS. If you do lean heavily on google assistant maybe reconsider, Siri is kinda shit.

Any Bluetooth earphones will work perfectly well with an iPhone, Apple’s devices just have extra features. In terms of Bluetooth audio the only non-SBC codec supported is AAC, which is implemented extremely well on Apple devices. It’s generally better than aptx and audibly nearly equivalent to LDAC at its highest bitrate, and equivalent at lower more stable bitrates.

If you’re shopping for new Bluetooth earphones and have an iPhone you may as well just get Airpods, they’re among the best on the market anyway.