NJS hubs. What's better?

**Yes. A lot of people tune their sprockets and rings. **The whole point of the EAI Superstar/Gold, Super Zen etc. is to offer a "read to use" product--- a bit like AMG or BMW-M.
P.S.: the coatings of choice these days are TiN (Titanium Nitride) and a number of ceramics. I honestly, however, don't see their great utility beyond placebo. A highly polished sprocket and using some special lubricants is hard to improve upon--- why at the Olympics one sees a lot of the top teams using "ordinary" DuraAce.

I mean specifically Japanese keirin riders.