@jonwatches1 The best commodity tube would be anyone’s guess. I personally sell more 300B amplifiers than any other, and more 6SN7 pres than 2A3, 845 or 211 amps. I also read an interview with WE posted two days ago that states their new facility was built intentionally larger than they required and that tooling and machinery for other types of tubes is already in place and has been for some time. Also stated was that 300Bs are much more involved and costly than making say, a 12AX7 or other Noval or Octal based tubes. Apparently they also do not want to make all of their tubes at a premium price, but understandably they will be priced higher than Chinese or Russian tubes as they want to maintain a higher level of quality. It I can find the link I’ll share it.
All the best, Aric