You should buy a male French bulldog if you want a playful and mischievous dog. You should buy a female French bulldog if you prefer a shy, quiet dog.
With that said, each French bulldog will have its own unique personality based on its genetics, early environment, and socialization.
In addition, when a French bulldog is neutered or spayed, any differences in personality traits between the genders disappear. Aggression and bad habits such as marking territory by peeing or trying to hump visitors also typically taper off. As such, the differences between male and female become less prominent.
In terms of their physical characteristics, at 20–24 pounds, males tend to be slightly heavier than females, who typically weigh 16–20 pounds. On average, males are also around one inch taller than females.