EH is made by Sovtek, in case you didn't know. Some EH's are said to be selected as the top-testing tubes from regular Sovtek runs, others seem to be exclusively EH offerings (the gold-pins, and some of their "copy" tubes like the 6CA7.)
That said, I've owned Sovtek KT88s and thought they were pretty bad, but I could be happy with their 6922s (a preamp tube.) For EH, I've owned the EL84 (okay), the EL34 (not very good) and the 6CA7 (fat bottle EL34 - better, but still prefer KT88s) as well as a couple preamp tubes I haven't any memory of. Svetlana (originals) and EI (Yugo) beat Sovtek and EH in all encounters I've had, though I still remain surprised by the Sovtek 6922 - mainly for their bass impact.
That said, these are all opinions, and system matching of course always plays a big part.
That said, I've owned Sovtek KT88s and thought they were pretty bad, but I could be happy with their 6922s (a preamp tube.) For EH, I've owned the EL84 (okay), the EL34 (not very good) and the 6CA7 (fat bottle EL34 - better, but still prefer KT88s) as well as a couple preamp tubes I haven't any memory of. Svetlana (originals) and EI (Yugo) beat Sovtek and EH in all encounters I've had, though I still remain surprised by the Sovtek 6922 - mainly for their bass impact.
That said, these are all opinions, and system matching of course always plays a big part.