1. It Can do karaoke.
2. It Can do Shoutcasting
3. It does slide shows better IMHO
4. It beatmixes and stabilizes audio better
5. Video Jocking is easier
6. You can make the screen bigger or smaller and move it around without screwing up the controls
7. It supposrts Drag n' Drop in the playlists and work areas
8. And as I found out one night after stomping on my power cord several times OtsAV continued to play even though I had no control over the computer at all. (Don't try this however it is a highly overrated way to DJ)
Don't get me wrong Rockit is a great program in it's own rights and has features the surpass OtsAv especially in the search arena.