How big's your crew and are there kids amongst them?
The X22 will handle better and feel faster. It'll give you more control over the wake shape. People will be more spread apart but will each feel like they have more room.
SX SHOULD ride in chop a little better. Storage is cooler. Seating's cozier, like the driver could have a quiet conversation with anyone in the cockpit. Then again, only a couple people can stand up at once.
Mechanically, the X22 has to be simpler to service (not that the SX is bad, though).
If you can drive/ride behind both, please do, and please post your impressions!!!