For some reason I still think CoD will be the higher seller. If its not I think its a shame that the most unique CoD will have the 'lowest' sales.
With that said, Im buying both.
Destiny = Play/level up with friends
Advanced Warfare = Lone Wolf frag fest
Platinums: Red Dead Redemption, Killzone 2, LittleBigPlanet, Terminator Salvation, Uncharted 1, inFamous Second Son, Rocket League