We have another thread going with this exact question, so you may want to look that one up too.
There is very little difference between girls and boys in this breed... it's more individual difference. (which surely DO exist in EVERY breed!) This is where working directly with an excellent breeder, and telling them about your life and your needs is very important. I want dogs for sports, so it's important for me to have high drive, energetic dogs. My dogs, as puppies, would have driven people who were looking for couch puppies CRAZY!!!
I have a boy and two girls. One of my girls is a little shy, and she is half sister to my older boy, who has never met a person or dog he doesn't love. So there are differences even among closely related dogs. My other girl is a little spitfire... her nick name is "Trouble dog".
BUT she is ALSO the cuddliest, and the ONLY one who will actively ask to sit in my lap. (which means I am often trying to work on the computer with her in my lap) The others LOVE to cuddle on the bed or couch, but are not thrilled about lap-sitting, preferring to be on the floor in warm weather, or curled up in a donut bed in the office with me when it's cold.
All three are VERY smart and trainable. The middle one was SO easy to potty train that it didn't even feel like "training". She just did it, learning by following Kodi in and out when he asked to go, and in between using her litter box. Kodi was next easiest, and I think he mostly took longer because it was my first go at potty training a dog. Panda took the longest, but that was because she had two urinary tract infections which slowed her progress and had the unfortunate consequence of making her fear the littler box for peeing. (she associated it with the pain of the UTI's)
Females are SLIGHTLY less likely to hump and mark, but they can still do both... it's a training issue. Females, areSLIGHTLY more likely to get snarky with other dogs in the household, (there is a reason they are called bitches
) but at least among mine and the other females I know (both spayed and intact) this does not extend to dogs outside the home, and does not extend to people AT ALL. Even at home, my girls (especially Pixel) will make snarly noises at the others to keep them away from something she wants, but there is no real fighting, and they all ALSO play happily together on a regular basis. It seems more a resource guarding thing than anything else.