Facebook (as has already been said) is way better. Easier to read, organise, it has groups, a better picture viewing system, and you have peoples actual names! It's no bloody hard trying to find people on Myspace as they go by the name of Sluttygonz345lkjd etc. Rubbish.
So you cant check out bands on facebook. Who cares. Use both, just dont say myspace is better.