I have had both, I went back to the standard transmission this time and spent the money on the air leveling system. I have found the basic transmission a bit smoother. It is plenty beefy enough even with my truck being chipped.
I've been happy with the regular one in my 13 also. Towed up to 26k numerous times, the only thing I found was needing lower gear to start out as I have 3.42's. But once it's rolling it pulls great. They do shift a lot nicer when empty.