I've always been using the white background, though the black is a nice little change around once in a while, so it makes no major difference when I'm enjoying my h-mangas/doujins.
I like it both ways....the light when I don't feel like clicking the button or don't care, and the dark when I'm fapping my self to sleep and I don't hant my folks to see the light of my monitor under the door(it can mean getting bitched out the next day if they notice I'm still up).
Hmm change fakku background to black and be be bothered by shit tons of ads, or keep it like this and go about my internet business in peace? I like the latter better