If your just asking which is better, Facebook is far superior.
I t has all the features of twitter (if sometimes somewhat harder to use), and a hell of a lot more on top.
I don't find much use of twitter except to fangirl over Joseph Morgan's status. Which of course I've cut down where on facebook I do find it the majority of the time on the site boring it gives me the chance to catch up with distant friends and find out about upcoming events.
I like Facebook b'coz it's better than twitter & the only thing you can do in Twitter is bust only posting a comment, you can do in Facebook is like, share, comment, add friend & you can play games....
I have actively not joined facebook, which at sometime may change.
I t has all the features of twitter (if sometimes somewhat harder to use), and a hell of a lot more on top.