Welcome to YT! I'm all for confinement until they know where to potty. It makes things easier on them and you. I like x-pens better, but that's a matter of preference. Just make sure to give him/her lots of supervised attention.
If you haven't chosen a puppy yet, please leave the puppy out of the equation, and focus on the breeder. Buy your breeder first, then the puppy. All puppies are cute and can steal your heart in an instant. There are so many things you want in a breeder. The number one thing you want, is unlimited support for you and the puppy for the rest of the pup's life. You don't want someone who will disappear as soon as the sale is over. A few key things you might want to keep in mind, you want a breeder:
-who keeps the puppy until at least 12 weeks old
-does genetic testing on their dam and sire
-knows her dogs lines for a few generations back
-if they claim "champions" in the backgrounds, it better be mom and dad. Anything farther back really is nothing more than a gimmic to get people to buy (in my opinion)
I hope you take the time to really research the breeder. Good luck on your search!!!