I don't have a myspace, but I guess you know, guys, that it is older than facebook, so... yeah, I don't know in what way it copies Facebook, hahaha. Myspace is more complicated and it gives room for more imaginative profile and showing off more of your interests and such stuff (as far as I know about it, I haven't seen it from a very long time). But Facebook is more fashionable now and more people have it and near me nobody has myspace anymore.
And after all fashion sucks, but for these kind of sites there is no sense in deleting the profile you use more (even if it is stupider). :) so yeah - you should decide for yourself.