Thats a tough qustion to answer cause it all depends on your wheeling locations. Most trails out here in WA seem to be built by Heeps so some trails get very tight with full width axles. I haven't found a trail that I couln't get thru where a stock width bronco could.
I like full with for stability and extra flex gains. Tight trails do make it challenging but most times you can manouver thru. In trees you might have to go past at 45* and turn the wheel to let one tire get thru first. What I've noticed is full body size rigs have a tough time as the upper area thats wallowing around is so huge, you can't fit. Our narrower Broncos with full width go right thru with no problems. Once you know your wheeling areas and what you like to do with your rig, you'll know.