What kind of fixed calipers?
From my experience on my E46, there is a significant difference between the OE euro floating rotor and the Stoptech Aero Rotor. The ST rotor just lasts a lot longer. The OE floaters wore pretty well but I had to replace because of heat cracking after 2 sets of pads.
2015 F34 328iX GT Glacier Silver
2011 E90 M3 Monte Carlo Blue
2004 E46 M3 Imola Red