I vote for vanilla. Although i would really like to play with a mod, that actually doesn't change anything in game. Something as Kaiserreich or 1914, or no ww1 mod or something like that. Im confident, that if we would play with that mods we could play the game with much less crashes as in mods which have massive changes to the playing system. It would be refreshing.
My comment on WIF:
WIF is a great mod if you want to prove yourself against the computer, where victory against the AI is achieved much harder. But in MP, if we ignore the crashes the game makes the game much easier to win against the democracies (So its unbalanced in the favor of colonial powers, democracies).
The Axis powers have massive problems with resources in the game and you must use considerable amount of time to solve the economic situation. Second because of the sliders the non democracies don't have any cash or very little to defend before spies. You are lucky if you are able to keep your research up, without actually spending extra IC on consumer goods. With that the allies can rape you with spies.
Well for allies, they are just weakend with the low IC efficiency and manpower, which is regained by events.