Which Tyre Size?

I'm thinking of reshoeing the Disco II with some nice BFG All Terrains (or maybe Goodyear MTRs). According to an article on Disco2.com

I can go up to245/75 or 265/70 without needing surgery, although the spare wheel carrieris a bit touch-and-go at that size. Both these sizes give about the same rolling radius (774 and 777mm diameter respectively). Anybody have any thoughts on which would be best? I tend to be more rocky than muddy. Is wider better, or will I regret the loss in turning circle?

Also, I keep hearing people saying you can put bigger boots on if you get a suspension lift. For example, an article on ExpeditionExchange

talks about 265/75s(that's 804mm diameter, or 9% larger than standard 235/70s) with a 2" lift,and the Disco2 article also talks about bigger tyres with lifts. But surely this is a misconception. When the supension is fully compressed, the tyres are going to be rammed up into the wheel arch just as much on a vehicle with a suspension lift as without, surely? The bump stops are in the same place, so why would the lift make a difference?

Thanks for comments, David.