Which guy should I ask out?

Go with Chris but try to comfort him before asking him out. Make sure u take his feelings into account and think of how u would feel if u were In that situation. Don't be afraid to cheer him up by going to the movies or something just as friends. He might figure out that u r better for him and Ariana wasn't meant to be. Don't rush it let him decide for him self and try not to make him feel awkward. Do stuff that he would enjoy if u do decide to go out somewhere. And remember that he knows how u feel about him and he feels the same about u. If things don't click u will know it just wasn't meant to be. :)