Neither. Rotors look better than both.
Probably just me but BBS look like VMR / HRE / TSW / Momo / OZ with varying grades of thickness in the spoke design and all are fusy. If they are your winter wheels you'd spend ages cleaning them and getting frost bite in the process. MTM are heavier than the moon. Practical head on here but surely you would want something classy, minimal in design and easy to clean / get your hands around with the wheel brush / mitt. Me personally I went for R8 V8 replicas which look OK, if I was really looking to spend cash Sportec Mono 10's or VMR 701's or the ones Dave had on his car.
How about some 18" replica rotors?