German döner are actually Turkish. Germany has a massive Turkish population. It's so large they have areas in some cities that are primarily Turkish. Even the Turkish president broadcasts to the German Turkish community at times as he knows how influential they are.
All this to say, a German döner is a Turkish one, albeit probably adjusted to German tastes.
Have I had one? Yes, many. Are they good? Definitely.
However, I like the Australian variety just as much, but they are definitely same same different.