twitpic vs lockerz ???

Found out that the twitter app on my ipod automatically posts pictures to lockerz, instead of the maybe questionably twitpic or cthonic yfrog. So in the interests of something or other, I'm going to post the links here so they can be evaluated and easily disapproved of.

blah.

http://lockerz.com/gallery/9840598

http://twitpic.com/photos/berniecrowsheet

http://yfrog.com/user/berniecrowsheet/photos

All these things get confused in my head so which one is the best or whatever each ones strengths are is something I dunno. Feel free to chide or hooray me.