31″ or 32″ BFG: Supporting Mods?

The park I goto, Hidden Falls, has open trails, tight woods, and rock crawling.
Not sure if the 31" or 32" tire would be better.
Primarily I’m looking for clearance and rock performance.
So far, I’m looking at the Zbroz 2" offset high clearance a-arms.

Are there any other mods I should do to support the larger tires? Anyone prefer 31" over 32"?