Black Ops 3 and MW3 hands down, honestly would rather play them sometimes then BO2 and MW2.
Black Ops 3 was pretty good, it had a good time to kill and I didn't mind the jet packs in this one. Only down side was that you could only get the DLC weapons through supply drops. Which a lot of people complained about, but they weren't hard to get. Also very easy to get sick skins, no pay wall like modern warfare 2019 and black ops cold war.
MW3 was the first call of duty I started playing a lot, I loved the infected game mode. Great campaign too, overall a great game.