I have 3 boys and can I just say that they are wonderful! All 3 of them are stuck to me like glue (which means private potty time can be a challenge--there is always someone scratching at the door to get in). Boys are sweethearts.
On the other hand, most bitches live up to their name
Here is some more food for thought too:
Boys are usually less expensive than girls (its a supply and demnand thing)
Neutering is ALWAYS cheaper and less invasive than a spay
And if you neuter them at 6 mos they will more than likely squat to pee
Best of luck deciding! Either way you will be happy!