That's a tough one... my thought (all other things being equal) is to go with a baby you can watch grow up in your own home. Of course, things are just about never equal, eh?
So far, I bought a baby from a breeder, took in a juvenile rescue who was scared out of his wits and turned out to be the sweetest boy ever, and took in an adult rescue who is making slow advances at being okay in this world. I wouldn't undo any of those choices... they're all so different. And wonderful.
Go with your gut. If you can meet one or both before deciding, you may get a feeling that one or the other is "supposed to be with you." Go with that. It will be the right choice for you.