Serious answer, the best and highest quality ballcaps on the market (mitchell and ness, 59fifty) use the straight brim style for their caps. If you want the straight brim look, the band of the hat will sit on top of the ears pushing them forward and down, tucking the ears in will prevent you from looking like the Mad magazine kid. If you buy a cap where the band fits around your head the brim will start curving which some people want to avoid.
And the sticker on the hat thing has been played out for a few years now. And fitted caps are also falling out of fashion in favor of the adjustable "snapback".