Do guys like smart girls or Dumb girls?

stupid question huh? but im being serious every guy has his type LOL. i tend to be a little ditzy at times that people think im slow and i make people laugh. except nobody takes me seriously cause most people think im dumb and that i should dye my hair blonde (wouldnt look good on a black girl). so what do guys like Smart or Dumb chics?? im not like E.C or anything my grades are decent i just act funny/slow