I agree with Bounty, but there are a few things you also need to consider.
With bigger heavier tires you will loose breaking distance and greater wear and tear on the brakes, rotors and axle component's. Not to mention the extra 20-30$ cost of the tires themselves compared to 33's. There is also the cost of lugging around a 35" spare, I do believe that 33's are the largest tire the factory spare mount location can handle (with a cheap extender bracket).
Most 33's are closer to 35" inch tires than you might realize. Toyo's for example, there 33's are only about an inch shorter than my Goodyear 35" tires. Not sure if my 35's are at true 109.9 inch in circumference (35 inches X 3.14 [pi]).
As for me I will be dropping down to 33's this year when I put on new shoes.
Even with gear's in both the transmission and axles the cost of gas, required to turn these massive tires doesn't seem to be going down.
And as for Moab rock crawling goes...I seen more XJ's with 33's on the same trails that I thought bigger tires was a requirement.