Commanders

I'd say: Let players choose their strategy on the battlefield, not in the game lobby.

That said, depending on what the stats and unique properties of the commanders are, this might work!

One could be a better Eco commander, one could be a better Combat commander. Especially if you only strongly differentiate the commanders in later stages of the game (after all, economies are exponential so early advantages could be huge!), I'd be okay with it because it could enrich the game.