Definitely the man with a twat. Dickgirls/futa/whatever the fuck you want to call them have all the feminine features you'd want, like birthing hips, soft face, tits, and scent, but with a little extra dick on the package. Cuntboys look like men, are built wide like men, have the muscles and hair of men, and smell like men. Giving a man a kosher hole won't hide the fact that you're fucking a man.
Always go for tomboys. All the attitude, none of the stigma.