This is both of them in gereral.
On the economic/civilian side:
You’re encouraged to use livestock more than than farming for food
Coin is less important as many things that cost coin now cost influence.
Influence is an actual resource that’s important not like export or favor (from AoM)
On the Military side:
They always have fixed outlaws (Desert Bandits) just like american civs always have Wild West outlaws from watch tower (outpost). And they seem to not need theatres/dance hall to make them not pop prohibitive.
They have two types of militiaman: one that’s a pikeman and one that’s an archer and they cost influence…
They’re regular military lineup is unusual: They have Jav riders (dragoon equiv) and Light hand cavalry (weak hussar) and heavy hand cavalry in the 3rd age. But the war camp has a critical gap…Ethopians don’t have an archer/skirmisher until 3rd age and Hausa don’t have a pikeman or musketeer. They must fill the gap with auxiliaries that cost influence. For Hausa it’s a musketeer unit that costs quite a bit of influence at the palace for Ethiopians it’s the levied archer from the hut Or they can use desert bandits just like Europeans or USA use outlaws to fill in weak spots early on.
At fortress age they have shared veteran upgrades that are pretty cheap…and ethopians gain a regular military unit that fills the gap that that was missing in age 2. And influence is now more importantly spent on things like artillery and mercen…Allied units.