I still haven't tried Zumba, but I love the 30 day shred by Jillian Michaels. I've done others of hers too and I like them all but the 30 day one is my fav!
I haven't tried Zumba yet either! I love 30 day shred, and I also got Jillian's new one that has great reviews on Amazon but I haven't tried it yet - Ripped in 30.
I *almost* picked up Ripped in 30 at Target this afternoon. I have 30DS, but I'm going to have to heavily modify all the bouncing around stuff because of my hip (which is acting up again, dammit). I love JM!