Aiden is a show line/ working line cross GSD. He is very low drive, moderate energy. He would run next to me on a bike or a 4 wheeler all day long without slowing up from being tired, and he could probably swim in the ocean all day, but there's only so much active ball retrieving he is willing to do and he would also be perfectly happy laying around in the house all day.
Carma is a working line GSD and she is high drive, high enery. She would do any active exercises all day long. She would chase a ball all day, play tug, run miles, swim, train three phases twice, and still come back to me for more. In working, she could be a little too much dog for some people. If you can't keep up, she tends to push you for more, and a lot of people don't know how to deal with the psycho drive dog thats pushing you for the ball and all of a sudden starts to do figure 8's between your legs because you haven't asked her to do anything else yet, or tries a hold and guard, or goes through the rolodex of everything she's ever learned to try and get that ball. Luckily, she has a good off switch in the house and settles well. Most people expect her to be a lunatic in the house, but its quite the opposite.
I think the fact that Carma has such high drive is what makes her extreme high energy easy to work with. A dog with crazy high energy that really has no drive to work with you for anything is much more difficult, IMO.