There are some kings and milks that are a little calmer than others, but all will be more active than a ball python. I don't have any milks, but my research tells me that hondurans and black milks are a little calmer than some of the others. They're also on the larger end of the size range. And variable and grey banded kingsnakes are less feisty than some of the other kings, and are on the smaller end of the size range.