rx vs rs
Front spindles on the vector are shorter.(Like the Apexes 06 and newer)
Rear skid in Vector different than RX, but transfers better and rides better.
Engines are different along with armor in the clutches, gearing in chaincases, carburators, and airboxes.
I've had both and there are tradeoffs to each one. The Vector is much more fuel efficient, rides better, but vibrates more. From 50-60 mph there is a vibrant frequency that you feel in the seat, bars and floorboards. If you ride under 50 or over 60 awesome sled, but my wife was always in that zone and didn't like it. Also due to vibration, Vector a little harder on bearings and clutch components. Hope this helps!!!