If you're going to talk about franchises you have to talk about ALL the games from a certain series. I could simply say that Mario Kart is a bigger franchise than CoD and point to Mario Kart Wii >>>> Any CoD game - but that would be ignoring ALL the other games. In reality CoD >>>> Mario Kart since there are a lot more CoD games that have sold 20m+ and there's really only TWO Mario Kart games that has sold 20m+
CoD Is bigger than Mario Kart when we take in to account ALL the game of the series (which is what a franchise is). So if you add up ALL LBP games (including the Kart game) and compare them to ALL of GoW games, which one has sold the most? That's how you compare franchises.
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Furthermore, I think VGChartz should add a "Like"-button.