I prefer Rosa over Nate cause design-wise she looks much better. She's just really cute! Nate's hair bothers me , but his outfit's not too bad I guess. Though in Black 2, I played as Nate cause it's my main game and I usually play as my gender especially for main games (with Diamond and Pearl being the exception). In White 2, though I decided to go with Rosa so it could the opposite of my main.