I am finishing up a Factory 5 Cobra Kit car. It came with Wilwood 6 piston front and 4 piston rear calipers and separate master cylinders.
After bedding the brakes, I was not impressed with the street perfomance of the brakes.
I attributed this to the race pads included. Wilwood, only offers race pads for the 6 piston calipers.
I did find and change to a set of Hawk pads which improved the stopping to a more comfortable level.
My point is, check the pads available for the brand you choose.
The original Wilwood pads would lock up all 4 wheels, but required more leg pressure or heat put in the pads, than I felt comfortable in normal driving.
One other note, the brakes are not power assist, manual all the way.
Quality of the Wilwood calipers was good. I have not exposure to the other brands.