Maverick. I love deep rulesets, and this machine has great strategy, depth, and awesomeness to it. Skill shots are more important for getting to the end in this game than any other. Every aspect of this masterpiece (yeah, I said it) is awesome. Best vid mode ever in playing blackjack for points and to relight your outlane kicker.
I can't say enough good things about it. I also loved the move, love all the quotes, music... never have a game I get mad at, it's without a doubt in my top 10. But all everyone sees is brown, Gibson, and Sega. I am also amused by the despise of the 4 second boat mech, despite the fact that most games hold balls for at least this length in one way or another throughout the play.
Xfiles would be second. Very hard machine, hard modes, hard shots, fast vicious drainer, great music, file cab is used nicely, great machine.