I rather like the assorted French & English trade guns and the Northwest gun made by caywoodguns.com Got a French Type D in November, beautiful workmanship & lock sparks very well, unfortunately also got a little physical problem that has kept me from shooting it yet.
My admitted prejudice for Caywood is that I am fond of my digits. I prefer to wrap them around a gun with a barrel made of steel that the steel mill has specifically produced to make barrels, Gun Barrel Quality 1137Modified. Almost all other muzzleloading barrels, with the outstanding exception of Green Mountain, are of 12L14. This steel is specifically designed to machine very quickly, good for high production on an automatic screw machine. Makes common hardware screws & bolts.
12L14 makes nice short, crumbly chips when machined. I am a metallurgist & have done a number of barrel failure analyses for now digitally challenged (former) shooters. Me, I just don't like crumbly steel around an explosion.