I'd say a slug gun, if for no other reason than faster re-loads.
...and I'm not exactly unfamiliar with fine Muzzle loading arms, either.
I'll tell ya' one thing.
This "Muzzy" designation I see being used here is about the stupidest thing I've seen or heard this year, thus far.
GTC
Member, Clan of the Border Rats -- “Sometimes I wonder whether the world is being run by smart people who are putting us on or by imbeciles who really mean it.”- Mark Twain