I have had kings in the past and balls now so basically they can both live in tubs all there lives IMO kings like to be out and about alot more and love to move around I have never been bite by a king they are super sweet in nature and enjoy being handled but do move around alot they are much thinner around then a ball is but get almost as big in length there prey is smaller and stayes smaller they also grow slower than a ball they stay on pinkies for a good while and max out on small rats at the bigest but could live on mice for a long time hope this helps