Without running the risk of getting political, I too would advise buy what you can, where you can?
I pretty much have an adequate supply of most brands already mentioned.
As to your original question? I really don’t have a go to brand.
Very rare that I have, or had a FTF due to the caps ?
Again, at this point of the game, buy what you can if you’re in a position to do so my friend.
Definitely need caps to shoot a percussion gun.
Respectfully, Cowboy