Same here. Seattle has a city negotiated franchise agreement (a.k.a. monopoly) with Comcast. https://www.seattle.gov/cable/franchises.htm
I've heard that Verizon's Fios service is excellent...
What is amazing to me is that Quest doesn't take advantage of their existing right of way to build out last mile fiber. Lazy dinosaur. That right of way is a huge untapped asset.