Rifled barrel or smoothbore?
According to the following article the English regarded rifled dueling pistols 'unsporting' while those on the European continent regarded the smoothbore dueling pistols as 'cowardly'.
Since there are two seemingly legitimate sides to the issue I'd, of course, take the rifled guns.
https://en.wikipedia.org/wiki/Duelling_pistol
Okay, color me embarrassed-I went a little deeper into the link provided and the specs say the pistol has a 1:18 twist. Sorry.