I think AFM may well be the most INFLUENTIAL pin of all-time. But, LOTR is the greatest pin of all-time as it has unique features which are part of the game play (path of the dead, sword ball lock, tower shot, etc) you have to use the entire playfield and then the code is just a masterpiece. I think you really can make a cogent argument for it as the all-time greatest.
But, honestly, who really cares. Just enjoy them all. Every pin in this tourney was great.
Respect all, fear none...