Let's see...
Hearts of Iron 2 has more mods than HoI3, currently.
Hearts of Iron 3 is less stable than Hearts of Iron 2, and it usually runs slower too. It used to be somewhat of a buggy mess when it was released, but most of this has been resolved.
Hearts of Iron 2 has battle scenarios besides the campaigns, Hearts of Iron 3 does not.
Hearts of Iron 3 is much more detailed, especially when it comes to units (The base unit level in HoI2 is a division, in HoI3 it's a brigade) and the supply system. On the other hand, this means HoI3 is also much more complicated.
HoI 2 is much more rigid when it comes to the course of the campaign (The war nearly always starts at the historical time, and things happen when they did historically). HoI3 is much more dynamic, with things happening because of game mechanics and not because they are scripted to happen.
These are the main differences.
Note that there are quite a few versions of HoI2, there's the original, Doomsday, Armageddon (Which is an expansion of Doomsday), Arsenal of Democracy (Which is a fan-developed improvement on Doomsday/Armageddon), Iron Cross (Which is an expansion to Armageddon or Arsenal of Democracy) and Darkest Hour, which is about to be released.
Quote:
Originally Posted by Krauter
Excellent.. Mostly just a grand campaign style.
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There are quite a few of those, but none about the Cold War since the days of DOS games. Supreme Ruler: Cold War is about to be released, but I have no idea if it's close to what you want or if it will be any good.
There are a few games that model a NATO vs. Warsaw Pact war at an operational scale, though.