Agree with TD... thats why you should change the diff ratios if you "permanently" change tyre size and also seriously contemplate rotor and disc pad selections.
IMHO for touring on formed roads and tracks I would choose the 265's... the extra 10mm of diff clearance won't matter squat really
Funny how people either love or hate Coopers.
I have never had an issue with them and when I change to another brand always end up going back.
I guess it is a 'horses for courses' thing.