I shoot a lot of Black MZ. Sportsmans Warehouse price 9.99 a can. But, that's not why I use it. It shoots good, cleans up easy, and has very little fowling. According to manufacturer it must be packed tight. It gives excellent accuracy. I won the last shooting match using a long rifle with a Douglas barrel, cap lock, and Black MZ powder. I felt like I was cheating. I use it in all my cap lock pistols, and where it really shines, is in my .32 rifle. The bore is ruff, and regular black powder, leaves too much fowling, to enjoy shooting. With the Black MZ, I can just keep shooting, and not worry about fouling.
I use real black powder in all my flintlocks, and some of my large bore rifles.
Blackhorn powder needs 209 primer, to ignite. Not acceptable for traditional guns.
With Black MZ, being such a good deal, I see no need for Triple 7.
I have used every powder that you have mentioned, but now only use Goex real black and Black MZ.