I had Brembo's on my 13 Roush and on my 2014 I have the Roush brake package, both 4 piston. The 2014 stops better for sure, no doubt. My 14 does have slotted rotors which I doubt changes much. Neither brake package stopped very well going 140+.....The 4 piston brakes up front are sufficient for sure, I have little brakes in the rear. I can only imagine that the 6 piston ones are far better! Anyways for normal street driving both packages were good, I'd say brembos were more dusty and didn't stop as good as Roush ones.
Phase 3 upgrade including CAI, Fuel pump voltage regulator, (629rwhp), 543 torque, Kooks LT headers with off road H pipe,ID1000's, Steeda Heat Exchanger, SCT tuner with custom Pro Dyno tune, BMR LCA's, BMR relocation brackets, BMR adjustable Panhard bar, BMR Rear sway bar, Steeda Aluminum driveshaft, Steeda X-brace, Steeda Differential cover, Steeda torque box brace/frame rails, Shelby trans cooler, Mcleod SS clutch line, RP fluids, whiteline transmission bushing insert and MGW race spec short shifter.