Rick, with you being a musician this might sway your decision. I had the Flip HD for over a year and shot tons of video blogs with it plus a lot of club and concert footage. While the video was quite acceptable, the audio left much to be desired. It was too quick to compress or distort under high spl. The Zoom Q3HD has just as good of video as the Flip, but the audio is WAY better. Actually the Zoom can do 1080p, while the Flip can only do 720. The audio on the Zoom is VERY high quality! Better than CD quality. I haven't used the Zoom for a dj blog yet, but I will be doing two next weekend. I will be recording Grace Potter in concert next Wed. I have a lot of videos I took of her last year with my Flip, so I will be able to do a direct comparison. FYI, my YouTube videos are under user 'wlflint'. If you would like to see a lot of concert and club videos taken with the Flip, go there to check them out. The Zoom videos will be added from this point on. The Flip is officially retired.
Edit to include: Neither have optical zoom. Both are digital. I think the Zoom Q3HD does the better job with it. I have noticed the zoom controls are too close to the start and stop record button. I have more than once accidentally stopped recording while trying to zoom.