I have hunted both coasts the past 3 years and in my opinion I would lean towards the west coast. The birds you will harvest will be about the same except for harlequins on the west and eiders on the east. Both coasts provided fabulous hunts and plenty of different species to take (looking for mounters) . I would highly recommend both guide services I used. The Captains were very knowledgable, safe, and really put us on the birds all the time. In the west coast I hunted out of Port Townsend With Dave Drewry of Penninsula sportsman . On the east it was john Nowinski of north Creek guide serice in Falmouth, Me. To me the big deciding factor was weather and pressure. The weather in Maine is very rough and inconsistant during the winters. This leads to a lot of lost days for guides due to high seas and winds. We had to reschedule our maine trip 3 times this year due to bad weather. I am very glad we did because when the weather layed down we went out and really hammered the birds. We were fortunate that we plannind on driving and had no plant tickets to change dates on. While the guides do have some spots to go in rough weather (but not too rough) they are not real producers. My personal observatons was that their is more hunting/guiding pressure in Maine than there was in Wa. I never saw another hunter the 2 years I hunted out in Wa. There are also not ooo many guide servies in the area. I saw several other hunters in Maine and have also read a lot about the "overcrowding" of guides services popping up. The eider numbers are down this year and one of the theories is hunting pressure. And there are a ton of guide services in the Maine area. Another thing to consider is that the limits are more liberal on Maine. Depending on when you go you can legally take 7 sea ducks, 6 puddle/diver ducks and 5 mergansers all in one day. On the west coast it is a total of 7 birds, regardless of species.