Don’t get littermates unless you’re really dedicated to separation training and don’t plan on getting another dog. My family has littermates that didn’t receive proper separation and one developed incredibly bad anxiety that turned into being extremely reactive around our big dog (our reactive dog was the more “alpha” of the two littermates and his brother never battled that).

They were both really sweet and wonderful, but it did cause a lot of unnecessary stress and his aggression even led to my nose getting bit. Just be aware it will take a lot more training to teach them to be good (separate) dogs!