Fav cod game?

All right, time to start a fire :D
Pliz no spoilers
Witch game from sieres COD is your favorie and why?
I won't start, i only played modern warfare 2  from 2009 and that's all from this franchaise, but Im interested in your opinions! 
But ill say what I know beacuse twitter culture lol
I liked cod MW 2 from 2009 beacuse of the story, yes I cried like once (or more if you include how many times i died on the easiest game difficulty) but It was beacuse the story was so good that you cant predict what will happen :0 
Idk if anyone will read that, but hey, you never know.. and remember - no russian