I own both...one of each. Snake #1 was a corn, Snake #2 was a ball python.
I was unprepared for the BP. Even though I thought at the time I was MORE than ready...
The main differences as I see it:
The corn is more active, and smaller. When I am handling Yoshi (the corn) it takes both hands and most of my attention. It really is one on one time...as I dont have the hands or opportunity to do much else (other than maybe watch tv or have a conversation with someone). When I handle Lucy (the BP) she usually gets a coil or two around my arm and just hangs out...but because she tends to be a little more nervous (shes about 2years, and not been handled much until she came to me) I still don't 'do' much while I've got her out...although I do have a hand free to refill a water dish or something like that.
Feeding them...Yoshi (corn) eats MUCH smaller food items, and ALWAYS eats...I swear that guy would eat skydiving. He's only refused once, and he shed the NEXT day and ate shortly after that.
Lucy refuses to eat every third or fourth feeding. And...she eats RATS. they're big. take up more room in the freezer (a lot more), are more off-putting to those not used to dealing with feeders, and a bigger issue when the snake doesn't eat it. (i cant put a rat in my compost...i live in an apartment so dead animal disposal can be an issue).
Attitude: Yoshi is Active, and the one i let all my friends hold. He likes to pretend he's aggressive (lots of tail rattling these days, and even a few 'S' stances) but I've never been struck at...and I've never been bitten.
Lucy is SHY... and timid. I get an 'S' stance from her almost every time I go to handle her...but again, no strikes. No bites. but I also don't let others hold her yet...as I don't know how she would do with someone who was also a little nervous.
haha...and it has to be said: BP's have BIG poop. I've been pooped on by both. Its nothing to be pooped on my a corn...the ball python covers you. Lucy pooped down my back once, and by the time I got the shirt off and saw the damage I couldn't belive it! It was my entire back. As wide as my shoulder blades and down to the bottom of the shirt. She got the pillow I was sitting on too...and my hair. Sounded like a water faucet.
I didn't enjoy it...but getting pooped on is a reality. You gotta be ready.
I was not...lol
What I was unprepared for was the size difference. It takes confidence to handle a snake, and the bigger the snake the more confidence you need. Its not fun to have a pet you are intimidated by...so for your first (of many snakes I'm sure) I would go with a corn. BP's are easy to care for, but sometimes are just harder to GIVE them the care they need. (for example: its easy to provide food...but getting them to eat can be more work). Get a BP next time.
I guess its most important you know lots about the specific animal your getting. how old? feeding records? handled much? any information like that... the more the better.
How frightening is a snake bite for you? because if your worried about getting bitten, its easiest to get over that with a smaller snake. (and get over it you shall! I may have yet to be bitten, but I dont worry about that any more than I worry about getting pooped on...lol)