Both are great lights. The Twisty is going to be a more versatile and efficent flashlight, whereas the LX2 will be brighter and simpler. Surefire, in general, is geared towards pumping out lumens. HDS Systems, on the other hand, places more value in efficiency. Further, the Clicky series (and I assume any future Twisty series) are programable and customizable: high CRI, guaranteed tint, narrow/wide beam, etc.
I'd opt for the Clicky/Twisty, but that's because they meet my needs better. I also think there is more bang for the buck with Henry's lights.