My favorite on the Blue Album is probably Undone, it used to be Say it Ain't So until I saw a video where someone isolated Matt Sharp's funny backing vocals and can no longer unhear it and take the song as seriously.
I am also a fan of the Green Album but not as much. The Teal Album with the cover songs was also pretty good renditions but I felt adding a cover album to the list instead of the original bands was a bit iffy.
I do enjoy that Weezer releases an album called "Weezer" with a different colored cover every few years.