Having skied on both coasts, in my opinion, this is the main difference.
East Coast- Filming is big. Skiers all want to go pro, move to Colorado, and film for big companies. They are used to ice and makeshift setups so they are good jumpers and jibbers. They consider it most fun to do the biggest and craziest trick.
West Coast- Skiers are used to soft snow and spend most of their time skiing whatever floats their boat. They hate to film and aspire to a lot less than east coast skiers. They enjoy skiing as a social activity and pursue other activities also. They absolutely hate to film and don't even really like to be filmed. They consider it most fun to do big floaty tricks with the occasional super tech trick thrown in.
The east coast, therefore, has more pros. However, I would like to settle the debate once and for all to the reason for this. West Coast skiers are just as good, and probably better, skiers than those on the east coast. A true west coast skier grew up skiing for other reasons than the spot light. Neither is better. Thoguhts?