I don't know. It depends. As far as looks, I think a 10.5" wide tire on 3.75" BS looks pretty good. They stick out, but it's not much. It definitely looks better than a 12.5". I like some tire beyond the flare, and for that reason I was leaning toward the 10.5". However, there are far fewer tire choices. As far as performance, on road, I don't know, 10.5" would probably win out, as the 12.5" will probably tend to wander more. Offroad though, the 12.5", would be more advantageous, spreading out the footprint more, providing a wider stance and protecting the rim better. I still want the Rubi flares, but I have some time now to find some. And if I stop at 33's, under armor, rock sliders and next year re-gear and e-locker and call it done. If not, then the flare issue will come back up, and as far as I can tell, it will be a mammoth purchase!