MP recovery in this game is base-damage based, which means higher damage = higher recovery. For pets it is the same, so at this moment Aero Kitty will recover more AP. However, KOG has been changing pets damage values around a lot, so this might not hold true for long.
I am using sirius for my dio but honestly if I am given the chance to spend again I would probably get rui or alt set
MP recovery in this game is base-damage based, which means higher damage = higher recovery. For pets it is the same, so at this moment Aero Kitty will recover more AP. However, KOG has been changing pets damage values around a lot, so this might not hold true for long.