It depends on wether we're talking about movies or books. If it's books Percy Jackson wins, this is because it has a much larger universe and, if we're talking all the books set in or related to that series. Yikes that's big if we're taqlking movies the harry potter wins all the way, all seven of those movies were amazing. The Percy Jackson movies were awful and ruined any plot the story had.
Percy jackson is way more of a developed plot than harry potter jj jandsf a sd fa sd f a sd f a asd f as d f a dsf a sd f a sd f a sd f as df a sd f as d fa sd f a sdf