31’s is much easier, and you can run them on stock springs, but its very likely that your stock springs are sagging. You could also run them with a 1” suspension lift you’d be in a good position. I ran them with the 2.0” OME HD and adjustable front track bar and rear relocation bracket, all in all which actually netted around 2.5”. It did look fantastic and I would have stayed there if my offroad needs didn’t require larger tires.
Just know that if you go the 2.0” OME route, you can easily jump to 33’s later. It’s all in my build thread. I might have gotten a little carried away, but I don’t regret it.