Originally Posted by
Opti-cal
All the EH models and Genalex are produced at the same factory, or at least they were a few years ago. They are then graded and become "Genalex Gold Lion" if they pass certain parameters. The gold pin EH's do sound better than non gold pin (silly I know) and are pretty much as good as the Gold Lion's. I have the Gold Lion's and I'm very happy with them.
Not much experience with the JJ 300B's but I really like their KT88's. Lovely thick glass and a very well rounded sound.
You have nice kit, I'd go with the Lion's as they're pretty much guaranteed to be the best of the 'non stratospheric' priced tubes.