In a Marshall 50W reissue (or anything, for that matter). Who uses what and why?
I'm totally sold on the JJs, though it does depend on the amp. They have a lower rate of failure & sound better. BTW, so-called "Tung-Sols" are nothing but a label & are made by New Sensor which makes a variety of cheap modern production tubes, not all bad, but to be sure, not the same as the old Tung Sol. For me it is either NOS or JJ.
In a lot of cases, this leads to a very dull sounding amp. Try it though, you never know.