Do kost players stick with 1 or 2 civs in ranked? Or kost do random?

I feel like other RTS I played the "gentlemanly" thing to do was always be random online. I am new and it is way too hard with how different they all are. So I started to stick with one. Is that ok? Is it different if I do solo compared to 2v2 (which I haven't tried yet).

Sorry *most