My .02
Stay with 34" or smaller if you do any offroad hill climbing, rock crawling etc. I don't think the drive train will handle the added torque larger tires would put on it for the long term. I've got 34" LTBs on mine (part time only, 33" for daily driving) and that's as far as I would go. I'm likely to go back to 33" on my next set. I've got the OME suspension lift which gave me about 2-2.5 inches of added clearance. That's plenty for the type of wheeling I want to do.
And that is the real question. What type of wheeling are you planning on, how often and what terrain? You can make 35" tires fit, but I would not do any extreme wheeling with our axles and gearing.