"Edit: btw just checked and the PS2's best 3 year stretch was about 55 mil."
I wouldn't necessarily count any time span as solid truths unless a console starts that period without and back stock units. I'm not sure what span you're referring to, but if it's in the middle somewhere, PS2 likely had units on the shelves, which means better sales if demand is high enough.
According to this 3 year idea, even if Wii sells the same per year for the first 3 years, it would be 15x3 = 45 million units sold, under supply constrictions... remove the constriction, and you're ONLY needing to make up a 10 million difference, which is easy to do during holiday seasons 3 times.
Numbers: Checker Players > Halo Players
Checkers Age and replayability > Halo Age and replayability
Therefore, Checkers > Halo
So, Checkers is a better game than Halo.