Im not a mare person either OP...as far as the two go.....party at cinco...looks a lot younger to me. He does seem to have much more of a dainty head. I like both of them to be honest. I like the body of the first, he seems I don't know, more grown into himself almost, part at cinco still looks super young, but looks like he will get tall with those long legs!
LOL, its a toughie for sure!! The mare is def a cutie, not a fan of the color, but color is really the last thing to worry about. Good Luck! Keep us updated on which you decide on :)