Well, let's add my 2 cents.
I'm using a Zeppelin (pre-Air) in the office, a Zeppelin Mini (pre-Air) in the kitchen and a BS8 in the home office.
When I last docked my iPhone to the Zeppelin in the office, I couldn't help but feeling it was incredibly 'boomy'. I missed a lot on the high-end, which I do get on the BS8. instead, I got a huge bass, making my music feel like rap played on a ghetto blaster. The BS8 seems to be a lot more balanced than the Zeppelin. I only noticed this boomyness though, when I got the BS8. Before that, I thought the Zeppelin sounded terrific. Now, I think it's terrible.
The Zeppelin mini though, I find really nice. Sure, it's smaller and really cannot play as loud, but the sound is a lot more balanced. Problem with the Mini is that the sound is less 'articulated'. It's harder to really feel there are different instruments playing, everything is more just mixed together. But in a nicely balanced way.
Soundwise, I would rate the BS8 first, the Zeppelin Mini second and the regular Zeppelin a long way back in third place.
Designwise, well, that's all just a personal opinion. I like them all.
Joeri