Master Cylinder selection help

I have tried both of the sizes you've listed and 1-1/8 as well. All were run manually with 73-75 A body discs. I'm currently running a 1-1/32 aluminum MC.
Out of the 3 I've tried on the same car with the same brakes, I prefer the smaller one because it felt best. I plumbed in an adjustable Wilwood proportioning valve in the rear line too.