"I have both. As far as preference, I don't like the 1 1/8". There is less progression, and the pedal is much harder."
Other than the master cylinder bore diameters, are both cars otherwise set up with stock or similar calipers?
If I did the math right, bore area of the 1-1/8" master is just about 1 square inch, and the area of the 22mm (7/8") master is about .60 square inches. A pedal throw of 2" with the larger master, would become 3.33" with the smallest. That is pretty significant. No wonder the hard pedal.
The 15/16" bore would require a 2.89" pedal throw to move the same volume of fluid, that is close enough to the 22mm bore throw (and easier pedal) for me.