Which camera is better ?!?

Trying to be unbiased, Id go with the Nikon. Since you are just doing it for friends, the fist thing I saw was just a bit more variety, such as the zoom. The other thing I saw was that it is a bit cheaper. if you do end up going to many concerts, this one has a higher ISO, so you can take pictures in darker areas. Id suggest reading those two sites below to help you a bit more. Good luck, and enjoy which ever one you get :).