I just calculated my ratings for all of these albums, and it's incredibly obvious that Steven Wilson's discography is like watching a child grow up. Each album gets a little bit better up until Deadwing, at which point the quality jumps all over the place. I'd be happy with either that album or Raven taking home the prize.
Currently, I'm only voting for On the Sunday of Life which is not an album so much as a collection of songwriting attempts (virtually all of which are unsuccessful).