EL34 vs. KT66 output tubes

For Push and Pull tube amps,
I always prefer 7027, KT66, 7591 and EL84 over EL34.
The vocal always sound richer over all than EL34.
The bass on EL34 is not neccessary better. It really depends on which brand/type of the tube and the amp you installed them on.
Always prefer the NOS tubes over the modern Chinese and Russians.

Yes, 'richer' is the correct word for what I am hearing. I little more forward as well. I like the bass with the KT66's; it seems a little rounder and fuller than with the EL34's, although maybe not quite as deep.

Well, that's why they make vanilla AND chocolate.

Most people, me among them, prefer the EL34 over the KT66 (and 6L6/5881), but the important thing is that you have found YOUR best tube!

"Most people, me among them, prefer the EL34 over the KT66 (and 6L6/5881)"
Trelja, I wouldn't say most.
9 out 10 audiophiles I know around NYC prefer the KT66 ( none chinese nor Russian ) over the EL34 ( all types )
Amp has a lot more to do with the tube.
Maybe most of the EL34 amps I've heard are less musical to our ears than the KT66/7027/6L6GC type of amps.
The only exception to our ears is the Vintage Marantz 9 PP amp from the 60s. That's the only EL34 amps we really like. Powerful yet musical ( except for the price tag.)
However, we did easily find many other KT66/7027/6L6GC and EL84 amps ( use it on higher efficiency speakers ) that sounded much better than the rest of the EL34 amps.

One should focus on the amp design and not the tube choice.

Trelja, I'm curious as to why you and others prefer the EL34 over the KT66. What are the characteristics of the EL34 that you prefer.

Chang, you mentioned a couple of times about not using the Chinese or Russian KT66's. Which brands to you recommend? Are there really good KT66's around that are not astronomically priced (I need 12 tubes)? What are the sound quality differences over the Chinese or Russian versions?