I like using the real stuff. I have used Goex for years, which is good. I have used Old Eynesford in 1 1/2f for 10 gauge loads, which I like.
Lately though, I have switched over to Swiss powder as it is a little hotter and cleaner than Goex. I use this in my 45/70s, 44 Russian, 45 colt, paper sharps, cap and ball revolvers, muzzleloaders and of course in brass shotshells for my Parker hammer guns(for which I use 2f).
Lot's of good loading resources online. There is nothing like shooting a double with a Parker hammer gun and black powder brass shotshells, which is what it would have used when new