Shane, the major differences I find between 12" and it's 9" counterpart is the way the music is presented. The shorter arm would have better detail, speed, transparency and more of the hi-fi thing (if that's what you're looking for) while the longer arm presents music in a more effortles, relaxed way with less highlighting.
They are just different and hard to compare...just like apples and oranges.
They are just different and hard to compare...just like apples and oranges.