[m3elmo]

the wider tire will give you more cornering grip. I would go with the 10.5 or 11.
As another example the 997.1 GT3 ran a 305 rear section tire on a 12" wheel. The 997.1 Turbo ran a same sized 305 rear section tire on an 11" rear wheel. It made a huge difference in the shoulder shape and how it could take camber on hard cornering etc.