That depends on the year...
I love Seattle in the Summer when one can go visit Alki, hike around Discovery, people-watch the awkward folk who forget what it's like not to wear cold/wetwear.
I love Seattle in the Fall when the leaves are changing and the familiar grayness settles in, when you can start to pick out the tourists and new settlers by who carries and umbrella.
I love Seattle in the Winter when everything shuts the hell down at the sight of a snowcloud. I love smelling the schnapps in everyones coffee and I love the occasional snowy day where urban snowfights and sledding breaks out as soon as the cars and busses shut down.
I love Seattle in the Spring when just as everyone forgets about the sun we get our first day over 55 degrees. The urban gardeners are quick to get their flowerpots out and you can begin to see the mountains on the horizon again.
I quite enjoy Seattle all year long.
However, Bellingham is still the tops.