I was never a fan of the LE's lightshow (pink, in Tron?..pffftt) but i can see why its highly rated. The combos alone make it amazing and if you have the ability to play it well and get in the 'zone of flow' thers not much else out there that can match the shot satisfaction.
I actually prefer MM as a direct comparison, but for nostalgic reasons. If i had them both, i would play Tron more i think. Possible breakages on a much more complicated pin like MM would haunt me in my sleep if i dared to play as much as i do Tron.
Number one? not so sure there. Time will tell....