Had CSC7's on my M340i Touring. Absolutely superb tyres. When it was time to replace them, I went for PS4S BMW Star * Marked, purely to try them and compare. Very little between them for most peoples 'normal' road use, although I felt the CSC7's had just a little edge over the Michelins, especially for ride quality.
Only thing that I found with the Continentals was wear rate wasn't too good. My CSC7's were down to 3mm ish on the rears after about 6500 miles. The Michelins are now down to 5.5mm ish after just shy of 7000 miles so I'd guess they are potentially on track to run to maybe 9000-10000 miles before they hit 3mm. To be clear though, that wouldn't be a big issue for me, I replace tyres as and when they need done and mileage isn't a huge consideration personally, its more of an observation.
Ultimately though, for most folk it would be impossible to split hairs between the two. Been happy with both and when it comes down to replacing them next time around, I'll just look at the best deals available at the time and go with what is the best value I think.