In my opinion, british, chinese and korean nations are the strongest till global. Usually you´re using many shooters (often mixed with howis and healers) and take advantage of the nation bonus there. From atomic up the most fight with factory troops and dont need shooters anymore, from here the germans are the strongest.
My story:
- german till enlightment; I had no clue and chose germans cause its my homecountry
- british till atomic; the brit shooters were deadly in my army setup and I liked the loot bonus
- german till now (CWA); 15% more damage on planes, HT,Commandos and everything else is more than any other nation offers
Chinese is never a strong nation. Their archers are technically better against foot troops, but they’re worse than Korean and British rifles. The rifles-cannons-healers arrangement is no longer as strong as it used to be because of the rebalance, which made defence far stronger. For example, my 29-5-3 troop combination, which formerly five-starred almost any base that wasn’t maxed on defence, is no longer really relevant at GPA.
If you’re going to use a rifler nation, British is really your only option, but it’s wiser to go German irrespective of what specific stage of the game you’ve reached. Infantrymen are simply more useful than riflers
before factory troops, which is an era that goes undermentioned here on these forums, but as a current GPA player, I can attest to the uselessness of riflers in Medieval and Gunpowder compared to foot soldiers.