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Just looking at previous sales (according to the numbers on this site).

KH 6.4m
KH2 4.3m

GoW 4.5m
GoW2 4.1m
GoW3 4.8m

The first Kingdom Hearts was the most popular, but they are roughly in the same ballpark on the other games. I think I've got to give it to KH3, but it would be pretty close.