The thing with corns is that they lay alot more eggs than BP's. Also, corn morphs are mostly recessive, so it takes longer to get visual morphs with them, since you have have to raise up the hets and breed them back to each other. Take a look at this site:
http://iansvivarium.com/morphs/species/elaphe_guttata/
It has most if not all morphs for corns, and there is also a genetic calculator in there somewhere.
Perks to corns, lower temps, you probably wont have to worry about humidity, unless you live somewhere that is extremely dry, and you probably wont have to ever buy feeders any bigger than mice. But from what ive heard the corn market isnt doing too well, so be prepared to hold on to some babies for a while.