Hi and Welcome to the Board!
Im no pro at the lines either, but from what i gather working line dogs are very high energy and have a lot of drive to work. These dogs can make great home companions but, like all GSD's require ALOT of excersise, mentally and physically. When trying to find a puppy that will best suit you and your needs, its best to talk to a few different breeders with different lines in their dogs. Ask them questions, and tell them what you plan to do with your pup when it grows up (home companion, SAR, Agility, Shultzhund, tracking, etc.) Most good, reputable breeders will help you in picking the right pup for you. Remember they want their pup to go to the best home possible as well, so if they ask you a lot of questions, they're not prying, they just want to make sure theire making a proper match. Im sure others will be able to chime in with differences on the exact lines and what their suitable for.
Im no pro at the lines either, but from what i gather working line dogs are very high energy and have a lot of drive to work. These dogs can make great home companions but, like all GSD's require ALOT of excersise, mentally and physically. When trying to find a puppy that will best suit you and your needs, its best to talk to a few different breeders with different lines in their dogs. Ask them questions, and tell them what you plan to do with your pup when it grows up (home companion, SAR, Agility, Shultzhund, tracking, etc.) Most good, reputable breeders will help you in picking the right pup for you. Remember they want their pup to go to the best home possible as well, so if they ask you a lot of questions, they're not prying, they just want to make sure theire making a proper match. Im sure others will be able to chime in with differences on the exact lines and what their suitable for.