The big difference between the 265/50 and the 255/50 is availability. Check Tire Rack, for example. There are 18 choices in the 255 size, and only one, the BFG TA, in the 265 size. The BFG "G Force" radials are much better than than the regular TAs, but they are not available in the sizes you are considering, or in ANY decent 16" size. (Well, maybe for front tires..)