Both have fantastic color varieties and are very fun to care for.

However, unlike ball pythons, if you leave them alone for too long, they may become more and more difficult to handle as time goes on!
Husbandry is much easier with corn snakes and kings, so I suggest checking out a bunch caresheets on both and see which would accommodate you better.

I have a couple corns (and some more on the way) and one lives in a 20 gallon long. An adult female will need a 20 gallon long or at least a 32q tub. Males can be a bit smaller.. my small male is in a 16q tub right now.
They should have hides, but don't need as specific ones as ball pythons do. They don't have to be super tight, and log hides aren't as bad of a choice for them.

Here are my two corns. My Crimson Corn Female and my Amelanistic Corn Male.



Foliage is always an option as well, and they don't need high climbing enclosures but a bit of driftwood wouldn't hurt for shedding. :]