Im not an expert but Im under the impression that bigger discs n calipers should mean less fade since u have a bigger breaking-area and therefore dont need to break as heavily as u'd have to with smaller ones, assuming u have the same tires on each setup to disregard that factor. But then again u can have better pads on the smaller ones minimizing the fade. But I would assume the pads on the M and M Performance ar at least as good as the OEM ones, so they should fade a little less.
Pure assumptions here.
Glacier Ag. F31 328iA M Sport oct. 2012
| Sport Automatic | Adap. M Susp. | Pano. Moonroof | 20" ATS Racelight Grey w. Michelin PSS| M Sport brakes | Harman Kardon | Elec. Seats | PDC F&R | ACC Stop&Go | 335i MPE | Perf. Parts |