This should give you some idea of the temperament the dog may develop, as temperament does run in the line and is heritable. Most Brittanys are from Dual backgrounds. Remember that the parents and grandparents are the most influential on the puppy's outcome. You should look for a pedigree with DCh. Be sure the parents, and preferably grandparents as well, are clear of genetic defects such as hip dysplasia and epilepsy.
Many people have a personal preference to the sex of their pet.
But once again, Brittanys are not a breed for generalizations. Characteristics vary from dog to dog, not within sexes. If you are getting a dog strictly for a companion, you should plan on having it spayed or neutered, and this will eliminate most behavioral influences, such as possible roaming in the male or false pregnancies in the female. There will probably be little question as to how the dog will turn out, so if you are looking for a good show or hunting prospect, you can be sure of what you're getting in an older, started dog. Many breeders occasionally have dogs anywhere from 3 months to several years old or know someone who does.