Mark W
Yep, I really don't really care that much I guess.
I am definitely in the "bigger is better" camp. I am after all the originator of MIBS. 
A 35 does not weigh enough more than a 33 to care. The impact on your gearing and brakes... same thing.
Personally I do think that 35s look a tad better under a 3 inch lift than 33s do.
A 35 inch tire will in fact fit in the original spare tire space under the rig. if you chose to carry it there ( I will on a long road trip over crappy roads in the middle of nowhere... other than that, I make other arrangements. It does stick down a lot).
All of that said...
The ground clearance difference between 33s and 35s... again, not enough to matter IMHO. The places you will get to... few people are working at the limit of their abilities and their rig's to the point that there will be any difference of where the two different tires will let you get to.
If you like the difference in cosmetics enough to spend the (admittedly small) extra money... Go for it. But there really is no other reason.
Mark...

A 35 does not weigh enough more than a 33 to care. The impact on your gearing and brakes... same thing.
Personally I do think that 35s look a tad better under a 3 inch lift than 33s do.
A 35 inch tire will in fact fit in the original spare tire space under the rig. if you chose to carry it there ( I will on a long road trip over crappy roads in the middle of nowhere... other than that, I make other arrangements. It does stick down a lot).
All of that said...
The ground clearance difference between 33s and 35s... again, not enough to matter IMHO. The places you will get to... few people are working at the limit of their abilities and their rig's to the point that there will be any difference of where the two different tires will let you get to.
If you like the difference in cosmetics enough to spend the (admittedly small) extra money... Go for it. But there really is no other reason.

Mark...