I admit I've never had a King Snake or a Milk Snake, but I love my Eastern Rat Snake (very similar to a Corn Snake). He is so much more active than my boas and ball pythons, so more fun to just watch. He's also really active when I hold him, which makes that more of an activity than the ball pythons, for sure. I'm sure someone else will chime in about King Snakes and Milk Snakes, but I don't think there's a lot of difference in behavior and care between them.