The Crockett rifle will be much easier to find. It has a longer barrel. And actually many .32 caliber rifles come with a 1-48 twist. Since they are roundball rifles. And price wise the Crockett might be a better choice. I never shot a .32 rifle. But have seen posts of those with the Traditions Crockett rifles and they seem to do real well. in the posts.
I personally have considered a small bore custom rifle. But Colerain makes a .36 caliber 1-48 twist and does not make the .32. But I figure that .36 might be big enough for things like a fox, or perhaps even a coyote if you could get in range. I want a flintlock when I get one. But that Crockett is a nice looking rifle.