Country of origin also makes a difference on the soy sauce. Product of Japan has a milder and less salty flavor than the Chinese version and derivatives. The stuff you find in white supermarkets tends to be closer to the Chinese methodIf it tastes good, that’s all you need.
Also, if you want less salt I’d recommend “Silver Swan” brand soy sauce. It’s less salty than Kikkomen soy sauce and I think has a better flavor in general.