I have a little boy, and he's pee pad trained, and never marks inside; he does love to lift his leg on walks.
Joey has been fixed and if you don't neuter a male they will probably mark inside around the age of 8-9 months, once they start to mark, it's hard to stop, even if you neuter them at that point because the testosterone is already in the system. So neutering before 8-9 months is best. For those that don't neuter, belly bands are recommended, it's just a cloth that hold a pad to catch marking, it's not meant as a diaper for pee, it's better to house break them.
You're right the clothes are much cuter for a girls, but they do make some awfully cute boy shirts, sweaters, and I just love hoodies! Boys and girls can both wear the topknot, and they make lots of bows just for boys. You might find that your little boy is less moody than a female. I'm absolutely nuts about my little boy!