Male Vs. Female

In most breeds, it is the females who determine the pecking order, also known as pack order. The females are the ones who compete to maintain and/or alter that order. The females are, as a result more independent, stubborn, and territorial than their male counterparts. The females are much more intent upon exercising their dominance by participating in alpha behaviors such as "humping". There is a reason people utilize the technical dog term of "bitch" in a negative connotation - and it refers directly to the behaviors exhibited by the females of the dog world. I have and love both male and females.  Males are usually more affectionate, loyal, attentive, and more demanding of attention while never getting enough. They are very attached to their people. They are also more dependable, reliable and less moody. They are more accepting of other pets and definitively take quicker to
children. Most boys are easily motivated by praise and food, and so eager to please that training is easy. However, males can be more easily distracted during training, as males like to play so often. And no matter what age, he is more likely to act silly and more puppy like, always wanting to play games. Boys are fun loving until the day they die. Male puppies will not hike their leg if you have them neutered at an early age. Females tend to become more reserved or dignified as they age. Witness the human equivalent of the twinkling eyed Grandpa still playing catch at age 70 while Grandma quietly observes from the porch. Neutered males rarely exhibit secondary sexual behavior such as "humping" or marking and lifting of legs. Once their testosterone levels recede after neutering, most of these behaviors (if they ever existed) will disappear. Boys who are neutered early (by 8 months) usually don't ever raise their legs to urinate. Male dogs will do whatever they need to do to gain your acceptance and praise. They are always near at hand, waiting for your attention.  Female dogs are often less pushy and "in your face" than male dogs are. They are definitely affectionate, but often it's on their own terms. They may request lots of petting,  then assert their independence by walking away when they've had enough.  Females usually are less distracted during training, as she is more eager to get it over with and get back to her comfy spot on the couch. The female is less likely to wage a dominance battle with YOU, but she can be cunning and resourceful in getting her own way. She is more prone to mood swings. The female also has periods of being "in heat" unless she is spayed. Seasonal heats can be a month long nightmare - not just for the female, but for you and every male dog in the neighborhood. If you are not breeding, it's best to have her spayed. During this time, she will leave a bloody discharge on carpets, couches, or anywhere she goes. She will be particularly moody during this time. A lot of personality changes and mood swings. A walk outside during this period can be hazardous if male dogs are in the vicinity. She will leave a "scent" for wandering intact males to follow right to your yard, where they will hang out and "wait" for days. Males have a way to get to her, they are sneaky and have ways to get into your yard/house that you never knew existed. In summation, I would say that if spayed or neutered, there is not a lot of difference between the sexes, except the slight ones listed here. If you’re planning on spaying or neutering,  I’d say just pick your puppy with your heart and not let sex be the determining factor.