Back Water VS Open Water ....
:coolgleam:RXP-X vs. RXT-X aS.
It's night and day.  As wiser men above have noted, the two-seat RXP-X is the machine for carving and lightweight out of hole performance.  The weight difference between the two craft is a little over a hundred pounds.  While one is listed at 255 and the other at 260 they have essentially the same power train.  The larger RXT-X is heavier and when you go with the active suspension option the weight difference is a bit more.  If you're riding open water in 3-5 footers, the larger active suspension is the way to go.  If you're riding back water with minimal chop, carving turns, the shorter boat is the one to have.
I own both a '08 and a '10 RXT-X.  The '08 is the three seat version of your boat.  The extra's on the newer model are cool.  I like the fly-by wire system, and having a break.  Relocation of the battery and a hinged seat are not that big of deal.  The handle bars allow more adjustability.  The newer hull handles the chop a little better and the gloss black looks great both on the trailer or in the water.  Are there any drawbacks to the newer design.  Yes, there are a couple.  Storage is water tight but its small, second speed is governed by gps on the new models.