From what I see British shooters is at best glory in IA, they have the big jump in damage and can kill buildings well. In Global Age howitzer take the crown, but the British can build howitzer too. And the army still need 40-50 British shooters so British still is one of the top attackers in Global.
The +1 range is more powerful than the Korean extra power. They kill defenders and towers without returned fire. The extra loot is good too. How many income you get from loot?
while German is good on paper, I didn't see much in top players. I guess the tanks and howitzers didn't need that +15% much, the rifle need it but you are better with British if you need rifle boost!