I have both a male and a female.
They both have their advantages and disadvantages, and it also depends on what you classify as an advantage
My little Pixie is absolutely the queen of the household. She has a very strong bond with me, follows me EVERYWHERE, no matter where I go - even to the bathroom to pee. She gets aggressive with the other dogs sometimes, even though she's the smallest, she wants them to know that it's HER food or water... and she gets touchy in bed. She likes to sleep under the covers at my tummy, and if someone steps on her because they can't see her or something, you hear this GRRRRRR! She is a little doll too though.
My Bogey is an adult that we took in earlier this year. He is so very loving and affectionate. He is very smart, and he tries very hard to please. We tease that he has a licking fetish: it's not a big heavy slobbery type, but rather a very slow, tender, affectionate type lick. He graduated Validogtorian from training, and he has a new job that he will be starting in January. He will be the new pet therapist at the nursing home by our house. He is absolutely the perfect dog ever for the job.
He does tend to hike his leg, but he has learned when that's appropriate (taking walks) and when it's not (in the house). He is not fixed and tends to hump on his friends when he is excited, but if you were to fix a male, I doubt this would be an issue.
I would not trade either of my babies for anything, but I have to say, I think Bogey is by far the best dog.... even if he does get a little fresh with his doggy-friends. We got Pixie first because I'd always heard that female dogs were "better"... but that's not necessarily the case.
I would certainly go male!