Seattle has better connections to Asia, given the way planes travel it is closer to Beijing, Tokyo, Seoul than any other major American city besides anchorage.
If by "better," you mean a couple of hours shorter, then Seattle may be better.
If by "better," you mean more frequent flights, more airline choices, more destinations, and more business/first class opportunities, then New York beats Seattle with just one of its three international airports. (Four if you count Stewart.)