When I got into BP, back in the early 70s, I was lucky to be living in Utah, we had several black powder specialty shops
and a couple of sporting goods stores that sold BP stuff. so choices were not limited. Lyman Great Plains and CVA were clearly the most popular, both kits and finished rifles. I built several CVA kits, and bought a Lyman Great Plains in .54 flint. we had several custom builders back then, Dennis Moford being the most prominent. Ranges were available every where, and if you were in an area where you were not allowed to shoot, the cops let it slide when they saw you had black powder guns. not many guys shot TC, and their sharp pointed patch boxes and furniture were a little futuristic, and kinda ugly (The Renegade being a plain Jane barn gun option). The price was higher than the others, and the only advantage I saw was the Seneca was available in .36 and that was not available from Lyman or CVA. Dixie was a catalog thing, and not many of those were around. At the rendezvous, the winners did not seem gun dependent, it was the shooters. I never owned a T/C, though I did shoot a couple, they shot OK, but did not fit me too well (had I bought that .36 I had my eye on, I would have restocked it to make it fit. But I finally bought a barrel blank and made a .32 barrel set for my CVA Mountain flinter. I have several CVA Mountain rifles, including a .54 with a Douglas barrel. and to be honest, the most accurate is a Spanish made Jukar. While its nice to have Douglas barrel, I still break out the Jukar Barrel when I need pin point accuracy