I'm not too picky between gender, but it just depends on what pokemon I use.
I don't spend my breeding time trying to look for a specific gender though, I spend more than enough time already (I really go for the best IVs i can get).
But yea, depending on the pokemon, i choose which gender I'd rather have. My current team right now is a perfect 50/50 when it comes to genders. 3 female, 3 male. lol coincidentally lol. I also like the fact that the genders are what I'd prefer for that pokemon. (i.e. Heracross being male, Kingdra being female, etc)
It's their appearance for me. Those that look manly I prefer male, and those that look feminine I prefer female. I do care for gender, as I'll never train the likes of Male Gardevoir and Female Machamp and such.
A few are mostly gender-neutral, so it usually doesn't matter for me in such cases.