Define better... I had the Cobra R Brembos on my 98 GT and the stopping force was better than the cobra brakes, but not dramatic. What made it dramatic is that i never got brake fade when open tracking along with brake cooling.
With the right pads and SS lines, you will be hard to tell a difference anywhere's except for a road course the difference in braking between the Brembo 4 piston calipers and the Cobra's 2 piston calipers. Plus you need 18 inch rims with the Brembo's, you can get by with 17's with the Cobra's.