Comparison?.......
It's kinda hard to try and compare one ski with the other. There are 2 seaters and 3 seaters. That's about all you can really compare to. Each ski has it's own characteristics and most owners will tell you, their own personalities. By your thread, it seems your talking about the differences between the 787 verses the 951....again, no comparison.
The RX is in the "muscle" craft category.
If I'd could only say one thing about this ski, .....it uses the 951 DI (direct injection) engine. If you don't know anything about the DI motors, then you might want to read up on them in the forum.
If you get one that works well, then it's a screamer!.......but, if you have a problem with one, they are a pain in the butt to trouble shoot. They have many component parts including a compressor that is needed to over come the compression stroke of the pistons for fuel injection.
I'm not saying they are a bad ski,........just be sure you know what your getting into.......................:cheers: