Personally I'd stick to stock when it comes to the rotors. Blanks are the way to go; they'll last the longest and provide the least headaches (no noise, &c). Slotted will go through pads faster and drilled are a thing of the past, I always wonder why they're still popular (probably because they 'look cool').
2011 BMW E92 335i, 6MT, M Sport, Le Mans blue - Michelin PSS, Quaife LSD, JRZ RS Pro, JRZ camber plates, Eibach ERS, full M3 susp, custom toe arms, Powergrid end-links, brake ducting, SS brake lines, UUC SSK, ETS FMIC, ER CP, Perf. Exhaust, work by VAC Motorsports