Which EL34 is your favorite and why?

Ditto Jond's recommendation for Gold Lion KT77's.

+2 @jond, we have been selling quite a few of these of late, including a set to pdreher for his Music Reference RM-9. For me, the Siemens EL-34s have been the best I have experienced in Music Reference, Cary, and VAC amplifiers.

Disclaimer: I run Tube Audio Store.

Golden Lion KT77's and I've tried them all.

I also recommend GL KT77 for their rich midrange but also a nice tight bass

simna,

Here's a link to Brett Jesse's EL34 website page which, aside from being his listing of tubes he has available, provides his listening impressions of various tubes, you may find this helpful. Also, you can look up similar info on his website for the other tubes you are after. My only affiliation with Brett is as a satisfied customer