The Chevy crew cab is significantly bigger in both front and rear leg room:
Chevy F/R: 44.5/43.4
Ram F/R: 40.9/40.2
Ram also has the "short" cushion in the center of the rear seat. It may also make a difference where the 60/40 cut is, based on how you use the back seat. Ram has the 40 seat on the driver's side, Chevy has the 40 seat on the passenger side.
The Ram is shorter in overall length, wheelbase, and bed length (assuming standard-bed truck):
Ram OL/WB/BL: 238.8/149.3/76.3
Chevy OL/WB/BL: 249.9/158.9/82.2
That lesser length gives Ram a tighter turning circle - 48.2 feet to Chevy's 52.7
Haven't driven the gassers, so I won't comment on the engines, but in driving FCA cars with the ZF 8-speed, it's very smooth shifting and you get the two extra low gears over Chevy which will help with launching a load.