OK - I have to jump in - having lived in both states. One coast isn't "better" than the other. The are just different. Yes - Oregon is more accessible and is traveled much more - the Washington coast is more remote - especially as you get further north towards the National Park. In some spots the nearest road is miles away and provides for some great multi-day backpacks.
Oregon on the other had has crabbing in Tillamook Bay, Cape Meares and the cheese factory, Bandon Dunes (some of the best golf courses in north america), Moe's clam chowder and the iconic Cannon beach area with Ecola State Park and Haystack Rock.
Both beautiful - but different.
Dave K