I think the question is sort of like, "Which BBQ is the best?" I like them all. Similarly, I love so many of the beautiful contemporary rifles I have seen.
All of that said, I think my all-time favorite rifle happens to be from the Golden Age (yep, stretching the rules of this question). The silver mounted John Vogler Salem, NC longrifle commissioned for a Lieutenant of Francis Marion some years after the Revolution. It embodies my ideal of a beautiful gun....
You can see this one in person at the MESDA Museum in Old Salem, NC.
God Bless, Marc