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.
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)...
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.
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