6922 tube companies, who do you like best?

Really, the more important issue is not so much the type of
tube but the damping and tweaking that goes into using the
tube. Start with something like the Electro Harmonix. Ad
a tube anchor from Mapleshade or Hal-o. Ground the tube if
possible and damp the circuit board or area around where
the tube is inserted. It may take a bit of experimentation
but the result is that there is precious little difference
in one type of tube versus the next once these things have
been done.