Math and physics are more theoretical in curriculum and less students can grasp, but ones who do perform better. So, higher input filter, earlier talent detection. Western education is more applied to a business, Russian is more like a generic theory. This makes Western schools prepare to develop, Russian to research. Note this is a generic distinction, MIT and Stanford are higher standards and provide access to field practitioners so my take it is genuinely provide more quality than MSU or Baumanka alike.