I've found corns to be "slither-ier" and fast, exponentially so when babies. I'm just now really starting to enjoy holding my corn, who is 18 months old or so, as he's "slowing down" his slither speed and is more apt to hang out for a few seconds here and there. =)
I held an adult corn a year ahead a go or so who was about 6 years old at the time. Granted she was the owner's "baby" and original snake, she was a wonderful snake to hold, so mellow, so I'm hoping my guy will continue to mellow out.
Best lap snake I own - definitely the boa. Neither the burm, ball nor corn will ever chill out as easily nor hang out as long as the boa will. =)