Choose which one you think you would be happier with, be sensitive to both of them, but dont date one or the other just because you would feel bad. Its a tough situation, just take your time to think about it.. carefully.
Follow your heart. If you cannot choose, take a step back from both of them for a while. Let them both know that you care about each of them but you need a little while to know where your heart truly lies, with a man or with a woman. Your heart will know what to do. Dont listen to it, listen with it.