Nice, I want to see the wheels installed!
33x11.5 will require less cutting for sure. The rubbing of wider tires happens when you turn, generally it's the wider the worse. I was running 32x11.5 before upgrading to 35x12.50. The 12.50 width required more cutting to make them fit. That being said, you mostly cut the inner back edge of wheel well and it's not very noticeable.
I would personally go for the 12.50 since you'll be cutting regardless.
...and post some pics.