Only by trial will you know. That said I just went from 32 and 4.10 gears to 35's. The gearing is fine but I haven't been off road yet. I liked the torque of the 32 and 4.10 combination on and off road.
I'd really like to try the 4.56 in mine, but it's just not economical to try and re-try if it doesn't work.
I vote 4.56.
2013 JKR, Auto, Yukon 4.56, Goodyear MTR/K 35/12.5/17 on XD222 KMC Enduro Beadlocks,Teraflex Big Brakes & Spare Carrier, Warn RC Winch, Metalcloak Front & Rear Bumpers, Metalcloak Overliner Flares & Front Inner Fenders w/ Corner Guards/Tail Lamps, Metalcloak Game Changer 2.5" w/6-Pac's, ARB Diff Covers & Onboard Air, AFE High Tuck Muffler, Front Lower Control Arm Skids, Artec Aluminum Skid System, Poison Spyder Hood Vents, Ripp SC.
There are no winners here; just beguiled participants