Well I rate both kites and don't think it matters which one you get. Both very stable platforms, both with the same relative wind range (the zephyr really is about a 15.5m compared to say a north 17m). Spent more time on the zephyr to be honest (actually a lot of time) but I have ridden the juice (and ridden enough kites to work out what it is all about. Pesonally its much of a much ness...except the you have to be aware that with the static bridle the bar pressure on the zephyr increases with wind increasing to a point it gets a lot to manage. But you'd be getting on your rebel before then anyway. Neither kite is a sub 10/11 kite on a TT so remember that. You will have more useable power at 11/13, start getting fun at 13/14. Both kites have remarkable drift for big kites, relatively quick turning. Jumps are easy and lofty with enough wind.
Personally though if your other kite is a north I'd be sticking to the juice if you can afford it, so the north feel stays the same. Ozone has its own feel across its range.
As I said both kites are excellnt.
Personally though I'd get an 18...

especialy given the rebel has such an enormous range.Wht stuff around...
I'm 73 kg by the way...
