Twitter is described as a “micro-blog”, status update, and a social network. Think of as a MySpace/Facebook minus all the crap.
Pownce is almost the same except you get options to upload files, post an image, and share an event on their calendar. Both sites are free except (I saw that coming), Pownce has a pro account feature. As far as I can tell, Pownce’s pro account only lets you customize your page with CSS. Are they serious?
My judgement: Twitter wins this one. Fuck a “pro” account to just use CSS.