6H30 tubes vs the others

I’m scouting the used listings and reading up on tube preamps. I see many of the older ‘heavy hitter’ brands like the 6H30 in their units, BAT using them in their upgraded pre’s even now, yet most threads/posts I read are down on that tube type. The flavor du joir seems to be the 6SN7, except in the mega-buck units. Probably a generalization, but it seems to be a theme I’m seeing. I’m considering an older ‘higher end’ unit as a way to try something, anything to see if I like tubes, and not loose too much if I don’t. I’m not technical enough to understand more than the most rudimentary explanations, but hopefully I can keep learning from those who have gone before...