Okay let's assume the "ugly but talented girl" will always be ugly and the "pretty girl who doesn't fuck well" will never fuck well...
Personality is honestly the biggest turn on. If a girl just has wind blowing between her ears, her body and face could be supremely sexy, or she could suck a bowling ball through a straw, but I can't maintain interest, I'm too old and set in my ways and know what I want now. I guess with age, you actually get picky with your partners. I know, it sounds weird to me too. I used to fuck *everything* that wanted me... (i.e. being the only relatively handsome bartender for wedding receptions got me many bathroom stall interludes with single women at the end of the night)
Anyway... I'm gonna vote on the attractive one in this case. A girl that isn't talented sexually is a non-issue for me. She can lay there and just receive me, no problem, I know how to work my hips to get myself off. And since I tend to get off on how much I can pleasure a woman, she can just lay there and I could suck her clit and make her cum within ten minutes at most.
I'm usually quite meek and humble, sorry if I come across as an arrogant asshole, but pleasuring women is the only thing I ever felt that confident with.
