Worry less about lines and more about dogs. Get out to some dog events, talk to people, pay attention to the dogs. My WL male was slow to mature but pretty laid back around other animals, no issues with other dogs, safe to take out in public but really territorial at home and always protective of me. High energy? Yes but controlled. Relentless, fearless, tireless. But go lay down and he would.
I have seen dogs from all lines that I would not have in my house if you paid me, and I suck as an owner. I happily encourage idiocy and misbehavior. Couch vaulting is an event around me, so imagine a dog I wouldn't live with. Before you narrow anything down to this line or that line get to know some breeders and their dogs and find someone you can trust because you will be living with this animal for a very long time.