Quoted from Deez:

While Tron is a great pin, IM is vastly superior. I've played tons of games on both machines. The theme is cool on both machines, the sounds and lights are fantastic on both machines, the advantage I give to IM is in the gameplay. Tron doesn't have the one more game gripping power that IM does. I get so engulfed in the pin sometimes it's hard to pull me away. I feel like I'm immersed in the game battling the iron monger or whip lash. Tron just doesn't have that. It feels like a series of tasks to complete vs an adventure. I've never walked away from a game on IM due to boredom like I have on Tron. I've just left free credits on the game. IM always gives me that one more game feeling. It can be brutally hard and the play itself takes such skillful nudging. It's just incredible. I wouldn't mind having either game in my collection, but wouldn't trade my IM for a Tron regardless of perceived value.