There is a number of things involved here first and formost is what gun you shoot.
If you shoot a closed breach TC they have well designed breach plugs and any of the regular 209 for reloading[ not the ones made for muzzle loading] will work with BH 209 and it will be the best.
If you can stand the crud ring 777 may be the best with a Knight some of them can not ignite BH properly, my self, if the gun shot accuratly with Pyrodex and I could not use BH then I would use Pyrodex I like the possability of a second shot while hunting we get 3 tags here.
If you use any traditional rifles or a pistol the pyrodex or black powder is indicated, I had to many hang fires in my traditional guns with 777 to trust it while I never have any problem with black or pyrodex.
Lee