Catapults for the early attacks

. That's about as likely to win the competition as going for space race.
Swords or axes is the name of the game, at least as long as the defenders are archers. And if our barb friends do a good job that might be through most of the game. Chariots are a bit weak and HBR much to expensive to research.
That's assuming we don't need astronomy (pretty likely) otherwise one could think about it then.
But it doesn't help to build axes as long as we cannot transport them anywhere. So our first priority is still research.
Still there is a point

. At some point we run out of useful builds. After pottery and granaries we want to be able to build axes for nice 2 pop rushes.