The Rottweiler is a dog that has been breed true for much of a longer time than the Corso, many corso's have rottie in them already, from 30-50 percent line breed and inbreed. The rottie in my opinion is a much better guard dog, sharper temp, and easier to train than a cc, but they are socially dominant dogs. The Corso's are good dogs, I have found some to be very happy dogs, overly aggressive, and inconsistent, but the same can be said for the modern rottie. I believe socialization is key for both breeds. I find the rottie to be more consistent and intelligent than the corso. I say look at each breed for what they are and go from there.