Production rifle= Savage.
Custom rifle= Ultimate.
I own two Savages and more Thompson/Centers than I can count. I like T/C's traditional guns but the Savage takes the cake for a production in-line.
The only custom muzzleloader I own, that I didn't build, is the Ultimate. I have not shot a NULA, although, I have handled one.
The Bad-Bull looks nice, except for the goofy priming procedure.
The only advantage the NULA or Bad-Bull has over the Ultimate is smokeless powder, but, honestly, I'll take accuracy over velocity any day, and the Ultimate is as accurate as they get. Period.