I'm kind of an odd ball, but the reason I went with the SBA over the RMK Assault or SKS is actually because I wanted the wider front end so it was better for spring-snow mogul bashing.
The IGX read skid soaks up bumps better than the semi-coupled RMK skid does IMO, so its more trail-friendly.
Doesn't mean you can't ride the SBA Assault off-trail, I've put quite a few miles on mine off-trail, but due to the wider front end and IGX uncoupled skid, its not going to be as good in deeper snow or sidehills as the SKS 155 or RMK 155 ....
Idk, I have two sleds, so for me it made more sense to go with the SBA over the SKS or anything else *shrug*