The typical understanding is that the bigger the bore, the travel is shorter and the pedal feels firmer. A smaller bore travels further before the brakes react.
In 2011 I tried to switch from my power setup in my Charger to a manual setup, to both save weight and to DEclutter the engine bay. I tried 2 different 15/16" units, a 1 1/32" and a 1 1/8" MC. The biggest one gave a rock hard pedal and the worst performance. At 200 lbs, I couldnt get the tires to skid even on gravel!
The smallest MCs gave better feel but still didn't stop worth a crap. There are unanswered questions on that project that I still wonder about today. I gave up and put the booster back on.