I have done some of both. As far as the breakfalls go, to me what is important is what they have in common, not the differences. They both teach you through repetition not to do what comes instinctivly; to put out your hand to break you fall.Also to tuck your chin so your head doesn't bounce off the floor, not to let your knees knock together, etc.
Then if you look at the throws - take for example the shoulder throw in SC and the judo throw who's name escapes me that is basically the same throw. In SC, you are told to get his arm all the way over your shoulder, and in judo you use more of the crook of your elbow to hook his upper arm. They both work, so to me neither one is 'wrong' and I would rather know and be able to use both variations.
As far as the 'SC is more dangerous, you attack joints and drop people on their heads' , you can drop someone on their head just as easy with a judo throw. And all of this joint attacking must make for pretty short practices. Yes, I was shown throws that attack joints (ie, the outer shoulder throw) but when practicing it, you always make sure to get close enough to the guy that that you don't damage his elbow. In a real fight, screw his elbow. Well, if you look at a judo throw like tai otoshi, when you practice it you always have to make sure to get low on the guys leg to not damage his knee. In a fight, screw his knee. So its the same thing.
The one thing from SC that was different and I try to do is to not always grab the gi, to try to make sure you have a handful of opponent.