Which one do you have? Which one do you like better? Which one better fits your personal needs?
Personally, I have both a Facebook and a Twitter account (and I used to have Myspace way back when lol) and I like Twitter because it lets me to just say whatever im feeling an unlimited amount of times and be able to get inside the minds of people you wouldnt usually be able to talk to like celebrities, political figures, comedians, etc. and I like Facebook cus its more....picturesque....if that makes sense....its where I post all my pics and it lets me chat and all that good stuff. But all in all, if I had to just choose one, it would probably be Twitter.