Both lose to Frisk. Only character you can't reset or undo.
__________________ What CDTM believes;
Never let anyone else define you. Don't be a jerk just to be a jerk, but if you are expressing your true inner feelings and beliefs, or at least trying to express that inner child, and everyone gets pissed off about it, never NEVER apologize for it. Let them think what they want, let them define you in their narrow little minds while they suppress every last piece of them just to keep a friend that never liked them for themselves in the first place.
Eh, it is debatable how hard Asriel was really fighting against Frisk, considering that in his mind he was Chara, his best friend and most treasured love one.
I think Frisk has the potential to be more powerful then Chara, but her little underground adventures just didn't give her the power necessary to be on par with her.