Hmmm, the JJs sound pretty good in my preamp (short plate), and the EH don't, by a small degree, sound as good. But the EH sound better as first stage / phase inverter in my amps. I go through a fair number of both types for my builds and they both have about the same failure rate (noisy, miss-matched sections, dead after a few hours, etc).
As previously stated, it all depends on which circuit they're used in. Ain't this fun?