This is by no means to start a fan war of both, for years I have seen some make this claim and I always ever fully believed it but after Last Jedi i may see their point.
Is it fair to say star wars was mostly an american thing, an american phenomenon whereas harry potter was a world wide phenomenon therbey making it legitimately a bigger cultural world wide thing than star wars? is that a fair statement?
if we look at their box office, star wars wins overall but that is mostly because of USA where star wars is bigger deal there.