Sometimes I am unsure if I see what I have been taught to expect or if the traits are actually there...anyway...if anything stands out:
The females I have had were not fans of other dogs at all. One would just ignore other dogs (except for family) but challenge the other resident female sometimes. The other is very leash reactive and also very assertive over other dogs. Both females were very cuddly/affectionate, not as territorial as the males (if anything, more-so over me), and "sneakier" about things. Also, my females have all been very quiet dogs around the house...no nonsense barking, no galloping through my house, not as messy (all spayed lol). Also both females were more sensitive to correction/took it personally?...in the way that if over corrected, it really bummed them out and would make them just check out mentally...I learned a bit about training from them.
UGH it seems like the males bark more!!! Also, only one male GSD I have had even likes to be cuddled/babied. He was just about hand-raised from birth and constantly fawned over as a pup (rescue) so I figure the two are related. All of the males patrol my property and seem ready to defend it lol. Two of them were much more goofy and playful...as well as more happy/fun-loving during training, and open to new things. But another was very serious/fun police. Instead of shutting off for corrections, they would get over it.
Different issues do not discriminate and depend on the dog (aggression, resource guarding, separation anxiety, weak nerves) imho. I handle dozens of dogs every day, at least a few-several different GSDs every week. Gender and breed matter, but you can't count on it. You have to treat every dog as an individual.
All but one has been everything anyone could expect for a GSD: Smart, Full of personality, Ready for anything and fun-loving, Intuitive, Quick to learn, Curious, Athletic, Adventurous, Opinionated, Whiny/Vocal, constantly shedding copious amounts of hair but easy coat to maintain otherwise...as well as likely a few things I can't tease out of my brain this early.
All of them have been great in their own ways. I miss the ones who are gone terribly