If you keep in mind that ranged infantry a staple to protecting any mixed army, then its no surprise that the nations with some of the best uniques are the Brits and the Koreans. So I agree with
Cielmers that ranged archers are obviously better.
Korean archers have increased damage, and when they're in large numbers they easily take down heavy tanks and generals like cake.
British archers have increased range which in my opinion, make them the best uniques in the game by default. There's a reason why a boxer's reach is important in the ring. If you can hit your opponent without them reaching you then it's clearly an advantage. Same idea here. The British archers are able to kill defenders before they even have a chance to shoot back and can destroy redoubts outside their range. Literally all you have to worry about are mortars and your AI not being dumb.
It's why many players are able to 5 star bases with archer spams and a few carefully placed sabotages on mortars. I left out the Chinese because although their archers shoot twice as fast, that doesn't mean much when their shots are only 60% as powerful as regular archers.
Heavy infantry are practically useless now ever since they were nerfed, and it's no surprise archers are filling their unit space instead. Heavy infantry are always the first to die and are ripped to shreds by redoubts and mortars. Pre-nerf, they used to be solid in the early ages when their common enemy were single shot towers and the occasional catapult. Now, post-nerf and in higher ages, they get vaporized within seconds when walking near a level 3 redoubt. Again, no one selects Roman for their unique, they do it for the army size.