I am on my second set on my Ssang Yong Musso (first one was 135/75R15, the currents are 31") and the first on my XJ (32").
Although I do not have experience with other Mud Terrain designs, I am very happy with the BFG. They do wear a bit if driven continuously on pavement, but no sound increase compared to the standard tires the trucks had. Now both of these trucks are closed-cabin, I do not know how they will sound on an open Wrangler, but I didn't notice any sound increase with them.
If I change, I'll go to the same again.
Rgds