Like most people have been saying, base your decision on what you want for gaming. If you favor next-gen graphics over next-gen controls, then get a 360. You know what games are out for both systems, so figure out what games you want and base your decision on that! If your parents are buying it, have them buy the 360. That way, if you want the Wii, you won't have to spend as much of your own money.
I have both systems and have only played the Wii for a few hours since I just got it yesterday. All I can say is that they're both sweet. You won't be disappointed with whatever decision you make.