The answer to this question depends on who you ask.
Some leave this to personal choice. Pink or Blue? Its up to you….
A Veterinarian may say its relative to the environment, such as if there are other dogs in the home, how the puppy is trained or what age sterilization is performed.
A breeder with lots of male puppies may tell you boys are more protective and girls more aloof. I do not agree with that statement.
My thought is if you raise a puppy with love then you are going to receive back the effort regardless of sex.
A very strong factor is the age of neutering. If male pups are neutered appropriately before the sex hormones are engaged, then you are more likely to have a happy experience with a male pup that does not life his leg or display those negative behaviors male dogs are known for.
A female can safely be spayed at 6 to 8 months of age well before her first heat without any negative impact on her personality.
So with all that said, males are more readily available because more are born in most litters and therefore less costly. This doesn’t not mean females are “BETTER” than males or that males are “Better” than females. Either pet will be a wonderful addition to your family. Both take training, devotion and love to become a great pet.