My GSD was a rescue so no choice there, My Bull Mastiff/APB/Lab/Mix was a male but he was a tri color only seen one other tri color pit mix so unique was the reason.
My Boxer was a female, I wanted a male but they were all unavailable, I wanted (needed) a Boxer right then! So I chose a girl! No regrets, girls are kinda stubborn but I loved her! Next Boxer only female dog in the household will be a girl Boxer.
So by default my next GSD will be a male.