I prefer Rachel too. I haven't really seen any interviews with either of them, but Micha's character on the OC is boring. The whole Marissa and...uhh, I forgot his name -storyline is completely dull, while Rachel and Adam's characters are too cute and they have great chemistry (I'm sorry, I forget their names on the show)
I think Micha is pretty, though, but on the OC she's just plain dull.