It has to be Pinball because it can't be digitally replicated accurately. I can play classic arcade games on so many devices. There is no substitute for real pinball. Even pinball simulators like The Pinball Arcade don't come close.
Attack From Mars
White Water
Theater of Magic or Circus Voltaire
It's tough.
Assuming it has to be video games, though, your rules don't forbid Neo Geo cabs.
So the 8 neo geo games in my 2 4-Slot MVS cabs:
Garou: Mark of the Wolves
KOF 2002
SamSho2
Metal Slug 3
Windjammers
Baseball Stars 2
Neo Turf Masters
Magical Drop 3
While I'd love a Mushihimesama Futari, Bubble Bobble, New Zealand Story & Ms Pacman I'd have cabs that used unique controllers
House of the Dead 2
Virtual On (either 1Vs1 OT or the newer 2Vs2 Force version)
Ikari Warriors or Midnight Resistance both of with use the rotary joystick
Tokyo Tank Wars, Virtua On 2 or Force, and then Whatever the highest multi-game MVS set they came out with was, full of Neo Geo Games.
Ok, probably jumped the space requirements, but Virtua On Arcade with the Twin sticks will always be a favorite. I never get the feeling that I'd enjoy World of Tanks as much as that old arcade game, lol.
My choice of a fighting game was super tough, but I chose CVS2 because I feel that it has all the insanity you expect from a crossover title while still remaining a grounded, traditional fighter, with a great and varied roster. Space Harrier and Crazy Taxi are just classic Sega at their best, and it only made sense to have a driving game with a sitdown cabinet and wheel.