This is a tough fight.
Moondragon feats are pretty impressive as she defeated Cap but with circumstances and stalemated with DD but used her mind blast.
Her only match with Mantis had no circumstances and she pretty much won fairly IIRC.
She also has a feat of topping down a giant that gave Thor a bit of trouble to other feats of breaking metal spikes with her punches or kicks IIRC.
Moondragon even out did DD in pressure points and gave him back his eye sight via pressure points.
But Gamora has the one up better feat, as in stalemating Thanos himself, though Thanos looked like he was holding back but still. Thats very impressive.
I might have to say toss up or a very slight edge 5.5/10 for Moondragon.
I'd say Gamora just because she is tougher but it would be a close might.
Richard Vasseur
www.jazmaonline.com