I would say that any 300B tube made with Molybdenum would be far ahead of those mentioned here.
As far as I know only Elrog makes them. I Have been through many tube amps (including 300B's) and use their 243's (211 with moly). And it's a dynamic leap, which reflects in price too.
See if you can get a chance to try a pair, or it is within your budget. I would think performance wise it would be a no-brainer.