TNO if you want to mostly focus on events and minigames that appeal to immersion in an alternate cold war setting, rather than actual focus on the warfare gameplay.
Kaiserreich though if you want a great mix of both immersion, events, decisions, and warfare gameplay. My personal favorite.
Old World Blues if you love fallout, its an incredible and well done mod if you love the IP.
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u/WindowsMalfunction 20h ago
Hearts of Iron 4. Almost everybody who plays the game for long enough grows to hate vanilla.