The 391 Urika Synthetic has a unique design in that it features "checkering" in the form of rubber inserts that are both beautiful, functional, and gosh darn it, just plain fun to touch. The overall look of the gun is arguably the most striking in appearance of all the synthetically-stocked autoloaders. Plus, the "Urika" (translation: shoots everything) also features a receiver with notches in place for scope mounting, if you would ever wish to use the gun for big game.
The SX2 is undoubtedly an excellent firearm. My purpose is to point out the special aspects of the Beretta product.