Welcome to the forum! All three manufacturers make good skis! Seadoo's have very powerful motors, but the Rotax motors can be tempermental which can take time off of the water by needing to tinker. Kawasaki's are well built skis but seem to be a little bit of a pain due to non serviceable parts like nongreaseable shaft bearing, or cheap plastic fuel caps on the
JS's (had to replace 1-2 each season). In my opinion Yamaha's are the easiest to work on and most reliable ski on the water. I am in no way trying to throw a biased opinion out there, as I believe all brands have their strong points and their not so strong points. I have worked on all of these makes (and more) for years and am trying to discribe to you the patterns I've seen over the years. All of these three choices have parts readily availible and would give you a long service life as long as they are maintained. Good luck on your search!