SIB are great snakes but I wouldn't advise a baby SIB to a novice. I had to take care of new borns and they tend to be finicky eaters as babies, especially they are tiny. Subadults and adults are much easier to care for.
They are very docile snakes and don't take up much room.
Hognoses have character and are active. They have that permanent smile.
As far as bite info check this website out. It is an extreme case...
http://www.herpnet.net/bite/
A bite depends on how long they are biting on you and if you are sensitive.
If you are allergic to bee stings then it may be a problem.
Anatess did a great job describing them and their care.
Both SIBs and hogs are beautiful snakes and both stay small as well.
So which ever one you decide on you will enjoy them.