The smaller bore master will give you more feel of the brakes and feel of the stopping power on the road. Chances are this is what your used to anyway.
The larger one will require more muscle from the leg and grab harder and quicker.
This is how I understand it to be.
I may also go your route. 11.75 discs.
I have the 9 inch drums on the car now so Willwoods may come instead.