Mine is an Egalitarian, Xenophile, Materialist Technocracy. My guys learned long ago, that it’s best to plan ahead and live in harmony with nature and each other. They will terraform all their planets into Gaia worlds, welcome all who wish to be a part of their empire and grant equal rights and utopian abundance (Shared Burdens require Fanatic Egalitarian, too bad). I’m also thinking about vassalizing every other empire on beneficial terms, thus also making them part of my federation.
Fanatic Xenophile, Materialist, Oligarchic government. The goal is to win economically. I would set the game to have slow growth in general. I would mostly rely on deplomacy to survive eventually build military to a point it would be the strongest in the game. Ideally I would form research federation with a megacorp for sweet tech and migration. For fun I would set my species to be unruly, thrifty and slow learners.