Ah sorry, I missed the Android head unit bit
Probably an OBD2 splitter then if you want to run both.
If it were me, I would find the P3 a bit easier to read but it depends what the interface looks like on your head unit, and how quick/accurate it is. It's one reason why I sold my RNS510 as I wasn't keen on looking down at the screen. Anything that's at eye level, or close to it, is better when driving fast!