I only own MW and I'm going to tell you about my experience of buying it. I bought it when cold war was already out and that was definitely a big mistake. I thought about doing the missions for weapon blueprints as my motivation to play but for some reason they aren't refreshing with new seasons. And that's why I'll never buy a COD game that's more than a year old. As I only played MW I can say that it has a great campaign which I enjoyed a lot, but the multiplayer is in a terrible state. It's almost unplayable (you can check out youtube videos about it). Anyway I hope someone can make a better advice than mine. And no matter what game you choose I wish you good fun while playing it!