The Svetlana EL34 Winged C was my go to tube in my Quicksilver Mid Mono Monoblocks. I tried the Genelex KT77 and unlike another poster, did not prefer it to the Winged C. It was more clinical sounding.
One new production tube I did like a lot was the Psvane EL34PH. It is their attempt to copy the original Phillips Metal base EL34. It became my tube of choice for my amps. They also make an EL34UK that is modelled after a Mullard EL34.
I also have some of their Horizon KT88 tubes that I am currently using which I like a lot.
I know I sound like a Psvane fanboy but after many years where Russian tubes were the go to tubes because of their availability and Chines tubes were mostly junk, I feel the tube landscape has changed a lot in the last few years. That being said, I can't speak re reliability long term although I've not had any tube failures with these yet. Also, they take a fair bit of time to break in.