i've read that males tend to be more playful and affectionate and maintain a more "puppy-like" temperament throughout their lives. they can be clingy and eager to please. they are also more easily motivated by food for training (like their human counterparts i suppose

) i've also read that females tend to be more independent and calm and become more "mature" as the years pass. they can also be moody at times especially if they remain unaltered.
my bunjee is coming up on 5 months old now. i had him neutered a little pass 4 months old. he's expressed no dominance issues, no marking. he still squats when he pees. the only time he lifts his leg a little (like a faction of an inch off the ground) is if he feels that he's stepping in a pre-existing pee stain on his potty pad while he pees, then he'll lift that leg a little so that he's not standing in a stain when he pees. it's sooo funny.
my understanding is that the lifting leg and marking thing is a dominance behavior that will not exhibit until the puppy is about 6 months, when he starts to become sexually mature. some puppies can unlearn the behavior once they're neutered. some puppies will continue to do it just out of habit rather than sexual need.
but male or female, you can't go wrong either way!!!