There's a brand called Kewpie, available on Amazon.com that a few
reviewers say is the best, but they don't describe why, other than
saying that it's creamier and less sweet. None of the Asian markets
around here sell it.

I usually use extra-heavy mayo, (extra egg yolks), like Hellman's,
Ken's or Admiration because that's what most restaurants here use. Is
that what it's like?

Has anyone ever tried it? It's kind of expensive, but I'd try it if I
think I might like it.