CF, less weight. Don't really need a moonroof on a sports car. It may not stand out on a black car, but I think that's kind of appealing in itself. If you get the moonroof, I think if you saw an M with a CF roof you'll say "I wish I had gotten the CF". But if you get the CF, I don't think you'll say "I wish I had gotten the moonroof".
'08 M3 JB DCT Coupe /// DTEC Cree LED Angel Eyes / Mtech Super White Cornering Lights / Matte Black Kidneys & Gilles / 35-40% FormulaOne Pinnacle / VRS Boot / VRS II Diffuser / AA exhaust / Fabspeed HFC & X-pipe / Eibach Springs / RDSport Front Bumper / 19" Satin Charcoal HRE P40 / RPI Scoops / PSW (Non-electronic) / BMW Stainless Steel Pedals / LeatherZ Alcantara Boots