For EL 34s I have used and still have NOS mullards, jj's, winged c's, NOS telefunkens, and two or three other brands I don't remember.
Once I purchased Gold Lion KT77's from Upscale Audio I never needed another brand of tube. They are dependable and very musical.
I didn't believe that any new production EL34 tube could rival NOS until I used the GL KT77 tube which changed my mind. Ignore those who have never tried this tube and make blanket statements. There is nothing but accolades for them on the forum. To me they are so good it is a waste to purchase NOS EL34s at today's prices.