Usually female, for several reasons.
1 - I tend to favor smaller, faster characters. Thieves, Rogues, Assassins, and so forth. Females often fit that better.
2 - I like to play a role that is a bit different from reality. Being a female character changes up the perspective somewhat.
3 - Honestly, many pre-made male characters are terrible. I'm tired of ex-soldiers. Female characters often have better back-stories.
4 - Related to #3 but I really dislike "super macho" types, be they male or female. Give me someone smart and tactical.
5 - I enjoy looking at females more than males and female characters tend to be designed to be more visually appealing. As I very much like different outfits and gear, I care about how my character looks.
