At his best, id give it to warpath. But since his best is infinitly undefined, ill give it to donna. We really never no where warpath is at. He sometines can fly, he can pull level 100+ potentially, but sometimes he struggles with relatively low level feats. Hes been done some massove injustices.
@BashengaTheFirst Prime Earth Donna Troy isn't a match for Artemis, or Arsenal really... They kind of screwed her in the reboot. She is even with Arsenal supposedly in skills, and Artemis is one of the strongest Amazons so it isn't that surprising. I would like to see the Prime Earth Supergirl battle, though.
Calling upon a composite of showings, James has managed to toss around Blob like a poker chip, and knock Juggernaut off balance, and some weaker showings. Something Donna has not matched... Fighting skills, Donna has held her own with Artemis, Arsenal and Red Hood, Jason Todd... While James has actually defeated Shatterstar twice and held his own against many of the Avengers and X-Force members...
No advantages on speed, agility, flight, or energy manipulation. Durability, is probably again with James... Given all this, I think it could go either way.