When in doubt, always...

[pwnerer]

Or, What Would Sid Do? WWSD

 

[digrosz]

Money money money money money money money money

 

[Princeofnigeria]

When in doubt? C-4.

 

[CornPlanter]

Artillery is a huge problem solver and equalizer. Not a panacea, though, but usually a safe bet.

 

[Miravlix]

When in doubt, troll the OP.

 

[SS-18 ICBM]

Pumping out more science only leads to victory.

 

[fbass]

Never sure if I have enough money to buy all CS favor..

 

[Merciorum]

Used to be tech. Now it is happiness. I cannot get my happiness to ridiculous levels any more since BNW. It keeps hovering around the 0 line, which is really annoying when you're playing as Persia or Brazil.

But I'll probably adapt in time, and it'll change back to tech.

 

[regeneration64]

Tech. This indirectly effects every aspect of the game.

Fail to prepare. Prepare to fail.

Artillery gets the job done though!

 

[JtW]

To be honest, I love culture and faith. Why didn't you include them as choices?

 

[neev]

Money of course. With money you can buy your science (research agreements, science buildings), your happiness (City states), your culture (City states and buildings), your military, and hell, even a victory condition (diplo)...

 

[Polycrates]

For me it's production. Then when you're not in doubt any more, you can build whatever the hell needs building that much faster. Universities, banks, artillery, whatever.

That said, in the late game - if in doubt, bombers.