Flip a coin ...seriously, being forced to make an instant snap decision will help you hone into what you really feel. For example if boy A wins and you're secretly pleased that he was the winner then you know he's the one. Or if you're slightly disappointed that it wasn't boy B then you know that maybe he isn't the one for you.
You can always try making a list of their good and bad points, but don't do a Ross from Friends and let them see it as it could seriously dent your chances with either of them!!
Go out with both of them. That's the point of dating. Don't get into a serious relationship, don't commit or promise anything, don't let the dating go too far (in other words, don't be promiscuous) and let them both know that you're dating other people (no need to tell them who). And have fun. It sounds like you're young, so enjoy being young.
you should make sure you know both guys well and that you areny miss judging them. try writing down a list of good and bad things about both and you can see what happens......if it is to close to call then u just have a big choice to make!
Like above says, make a list, all there good and bad traits. The flipping a coin sounds a great idea. But like above said, thats the hope point of dating, its not like either of them what you to be in a relationship with them so see both, until the day one of them says "Want to make this exclusive?" you are a free agent to see who you want. Get to know them abit better, you may find one of them isnt what you are really looking for.