I do think that Ashe is the prettier of the two and Fran would be the most sexy of the two though. If I was a guy it would have to be a tie between the two.

As for the men...
I'd have to say Balthier, because he's witty and all that expecially what Yeargdribble said :rolleyes2
And i do like Vaan as of looks but his personality is a little immature for me > . <