There isn't a bred for both worlds. It's a fricking myth propagated by worthless showline breeders to sell their product. I can count on ONE hand the number of showline GSD's i'd even consider having at my house. They were nice dogs, sprinkled very, very, very thinly amongst mostly **** and I do mean ****. Talk to the owners and one could really believe they had the best of both worlds. In reality, being the guy that works them, they are NOT even in the same class. Not by a long shot.
Sure they might be "nice" dogs and somebody's "Best" dog in the world, but stacked against working dogs, they aren't even the same breed if you ask me, not even close.
I have never come across a "showline" mal breeder because I have never seen one in any working venue at all. No Mondio, no french ring, no Schutzhund. So if there is some breeder out there saying they are producing the best of both worlds, I'd love to see them, cause I have yet to see anybody worth anything that are breeding for anything other than WORK because it is a working breed. If they have nice dogs and are breeding for the ring, then I doubt they are proving their worth as a worker, and if they are it's on a very small scale. The dog world is small even in this big country.
If I was looking for a Mal here in the states, there's three kennels I'd look at to start Loup de soleil, von Donnertal, and ot vitosha.