Let your ears be the judge. I don't even use bluetooth in my car but hardwire the phone into the car's system.
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Bluetooth is generally inferior to wired or WiFi connection. If both sides support aptX, quality takes a step up; if they support LDAC, another small step. Still, for my main system, I'd prefer an uncompressed connection.
At AXPONA, Audioengine was demonstrating their speakers with Bluetooth. In my opinion, they did themselves a great disservice, as the sound was pretty flat and gray.