How YouTube's MixBit differs from Twitter's Vine

From Kit Eaton at Fast Company:

MixBit's differentiator is hinted at in its name--instead of merely being able to share, view, and comment on videos from the stream or from people you follow on the service, you can also add to and remix content uploaded by other users or yourself. Remixed videos can be up to an hour long, which may make the app appeal to the kind of creative video minds that are into sweded clips or for users who want to string together their own mini-films.