I rode both before I got my XO last year - I liked the Reign a lot more. The Nomad never felt like it had nearly as much travel except when landing a drop. Coming from long 4 bar bikes like FSR and Ellsworth, the Nomad felt like it had 5.5" of travel until you really hit something hard. The Reign felt like a 6+" bike, especially over small bumps. Of course the Nomad climbed really well, but with a touch more chain tension over bumps. This translated to really good traction, but the Reign wasn't bad either. Also, the Nomad's cockpit didn't suit me as well for my longer arms. Kept me too upright at proper leg extension (Higher BB added to this). I would have needed a layback seatpost and my gravity dropper is straight. I didn't want to lose that.
Also, while both specs say 67deg HA, the Reign felt slacker. The BB is about 1/4" lower too which can be a negative for clearance but does make the Reign corner just a touch better IMHO.
Obviously I'm biased at this point. The '09 Nomad with better pivots and grease ports might have got me on board since I bet it's stiffer than the X rear end, but the older one wasn't enough of a draw to get me psyched.