Best war game AI? Which title?

[Protonic2020]

I realize that overall it probably is pretty much the same overall for games. But is there one game that sticks out to have an AI that´s a better opponent than in all the others?
I want that one then, i am in shopping mood during the holiday sales so i better ask before it ends.
(You cheap b*stard...)
- What was that!? Oh it must have been just the "wind". Cheers
Snickers, i just had one, actually. A chocolate bar that´s a cheap replica of that brand candy bar, OK done.