The best game of all time is probably the second Pac-Man Championship Editon. Too bad it's long dead now, and the second one doesn't measure up.
The first one is on the Pac-Man Museum but has the annoying Leaderboard setup instead of just telling you your ranking organically though the menu's like the second one does. Oooh the first one is also closest to the claasic gameplay, no bombs or slowmo, if you're a purist.