Definitely Facebook! Myspace was probably one of the first social media sites out there, but they somehow they just didn't get it right. Myspace is now used by a lot of musicians, while Facebook is used for many MORE reasons. Facebook has a lot of marketing and seo potential, so Facebook all the way!
I think FaceBook is better for (SEO) marketing, Maybe i am wrong, but i have more traffic from Facebook.
I prefer Facebook for my SMO works as it is easy to promote and gets better results in a short period of times.
As much I know myspace is only popular in US and some regions of Europe but Facebook is famous and widely used all over the world and I also like facebook more than any other social network.
I actually like Facebook over Myspace.Yes I really do prefer Facebook because of the spam area. And the thing is, personalizing profiles can be taken really overboard, and that just.I started out with a MySpace and loved it...though eventually I got a facebook. After a few months, I realized I almost NEVER went on MySpace anymore.
Facebook is much popular nowadays and it is very user friendly and provide many applications which are very useful.