Choppy Bluetooth audio: How to persist Bluetooth bitpool settings on Mavericks?
Solution 1:
To force the system to use USB Bluetooth by default, try the following command:
sudo nvram bluetoothHostControllerSwitchBehavior=always
This will modify your boot kernel arguments.
To do opposite, use never. The change would be applied after the reboot. To return to the default, run:
sudo nvram -d bluetoothHostControllerSwitchBehavior