I have slightly the same opinion. In any dog I've ever owned GSD or not I've always seemed to prefer female. Only because in my personal opinion & experience they always seem to make the more loyal protective dog. Most the males I've had were ramblers of sorts & never developed such an incredible attachment to me. When I recently got my first GSD a while back I was getting her for guard dog purposes as my lab husky mix that I kept outside passed away over a yr ago. I went for the female again. This was the first time I requested female when inquiring & it was because I also pondered on the fact of which sex I think I prefer.All 3 of my shepherds have been female.....
I used to say they stay close to home as my rationale for getting a female....and perhaps there might be some truth in that...But, if I didn't thoroughly enjoy the first two ...I wouldn't have a third....who is incredible.
I dealt with Male/Male and had "issues" but that was my failing!I choose according to what will fit in with the pack at the time. My next dog will probably be a female.
I prefer males though both genders are fine~not dealing with heat cycles is a bonus in owning a male!
I just don't know if having male/male would be a good idea. Hard enough dealing with two spayed females and an intact male. The females are getting older, so it will be awhile before I add anything.