We could endlessly argue about whether Myspace or Facebook is better. I will give you a few points to think about.
1a.Myspace gives you the complete ability to customize your profile page. 1b. Facebook does not give the amount of customobility that Myspace does. It does keep everything quite uniform though (add friend, message, etc. all in the same place) which is good.
2a. Myspace has pornography and bad ads. 2b. Facebook has cleaner ads. NO pornography.
3a. Myspace- unsafe 3b. Facebook- safer
In the end, I think Facebook wins for security, and clean images.