I can't speak for the kawasaki, because I've never owned one. We have 2 sea doos and absolutly love them, one is a 07 GTI and an 06 RXP. The GTI is a great all around fun for everyone jetski. The RXP is the supercharged one that's a blast to drive and superfast, but it's easy to tip over with 2 people.
I'm sure kawasaki has the same type of models, it all depends on what you are looking for.
Jeremy