°pov: you are in the mugan train arc!°

When akaza rengoku rengoku are fighting, you come across them and you decide whether or not you help an upper moon or a hashira, will you become a demon or will you save rengoku? Which when will you choose? You can become a Slayer but with a human body and no regeneration, or you can become a demon with a art and instant regeneration... which path are you choosing?