Carbon leather is the best trim by far - even with my black extended it still has a little contrast.
What does contrast matter? It's about what you like and what looks best, which is CL not that cheap aluminum trim the M5 has...
'12 CLS550 Palladium Silver - loaded
'11 E92 M3 ZCP - SG/B-EXT/CF, M-DCT, loaded
'11 E93 328i, BSM over Saddle Brown, sport, loaded
'08 550i M-Sport, Carbon Black (Gone but not forgotten), '06 W211 E55 AMG (Gone, miss this animal),'01 E39 540i Sport