Just see which one you have the best chemistry with and go with him. But, don't burn any bridges, someone else might end up being the right one for you...

And, just remember, the big thing is mutual chemistry, so you might be more into one of them than they are you, one of them might be more into you than you are them, so just keep your options open.

And, you all have the same goal (well, some might just want sex, which is a good goal as well), so it's not a competition.