At the time I when I bought my wheels there were less choices . I picked the C20 and love them . They are light , balance beautifully, not too hard to maintain , and IMO look stylish. I almost bought the Champion Magnesium but there were only four left at the time and I really was bitten by the C20 bug. The Magnesiun wheel still lingers in my mind because it was a close decision . I never drove a car with the Magnesium wheel though and the P40 wasn't even offered . I wonder if anyone has driven all three or even two out of these three to note some similarities and differences . Thanks in advance .