Hawaii probably consumes more shoyu per capita than any state in the
union. Heck, we can get it at McDonalds. The most popular in the state
is probably Aloha shoyu. This is a hydrolyzed product using a process
developed by the company after WWII when they needed to make the stuff
fast. I think it's OK stuff.
I like Yamasa more than Kikkoman. My current favorite soy sauce is Lee
Kum Kee Premium Soy Sauce. It's a Chinese style sauce and has a darker,
deeper, taste. I love that stuff! The idea of using it on a plate of
soft tofu though, it horrifying. For that, I really need a Japanese soy
sauce.