best late game civ for 4v4s?

i just play casually and have huge 4v4s, nobody fights until 30-40 minutes

what civs are unstoppable late game? (and ideally have good defense)

and what units should i make? been playing ottomans recently and spamming man at arms + janissary (man at arms tank while the gun bois open fire) with some great bombards and the piano cannon for extra dps.

but have been getting destroyed by huge swarms of royal knights.

i've also enjoyed byzantines but idk if they're late game or not and which of their units are good for my main army.