it looks like across halacha ashkenazim end up on the stricter side and sephardim on the more lenient side, in basar b’chalav, in kitniyos, in cholov, in all kinds of places. why is that?

is there a real difference in how the shitos developed, like the rema’s glosses on the shulchan aruch pulling stricter, or is that just how it looks from a few famous cases?

and where are the biggest real differences today, the places where an ashkenazi and a sephardi standing in the same kitchen would actually pasken differently?