I love them both, just the down side for me personally is that a rail is $$$ to fix and only usable in the sand. SXS is no rail in the sand and not capable of keeping up, but still a very very fun dune toy and I can take it to Utah for trail riding, which is why it is the better option for me personally. Rails and SXS's are both awesome machines, it is up to the individual owners as to what works for them.
Back on topic, I will be headed to SSSS, room is booked!