Battery Relay or Isolator

[SouthRuninIt 10+ year member]

I need help please I don't know which one to get I have read pasted forums but I still cant decide on which one is right for me... I want to play the music wit the car off sometimes(like when gas goes back up) and but I will also be playing it wit the car running of course I will be using two or three batteries because I will have two 5000 watt earthquake amps and that's just on subs I already got my hi current alt from excessive amperage so now I have to find out which one do I need... Battery Relay or Isolator

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