My Myst, the 11 yo GSD, is the same as you male.
She has never been interested in anything but balls. Tennis balls, which she loves to pop (about a min.) and slightly larger fuzzy balls with squeakers. The latter she never tears apart, we still have some of her favorite ones from her puppyhood. It's funny, she loves chasing them (well, loved, really, she's got a degenerative spinal cord condition now, and her hind end is being progressively paralyzed, so chasing things is no longer possible, poor girl

), but as soon as the squeak happens, she starts this weird moaning noises, and handles it very gently. I've always wondered if it's some kind of .....-caring-for-puppy thing.
The best toy for her I discovered (other than food-delivery toys), was the squeaker tennis ball. Not sure who makes it - Kong maybe? - but she won't pop them because they squeak. They are just slightly larger than a regular tennis ball, but not by much. Myst still prefers the regular tennis balls - but I just don't give them to her anymore, other than a rare treat. LOL
Dogs are such characters...
Uh huh huh huh huh huh...
My 12 year old female boxer loves toys. She will play with almost anything we bring home to her. My 10 year old male is another story. The only thing he will play with is the tennis type balls. We even tried other balls, like the rubber ones, he will have nothing to do with them. And of course the tennis balls last all of 5 minutes before he chews a hole in them. We got the so called industrial strength "indestructible" tennis balls once. They lasted 10 minutes instead of 5.