I'm a late-comer to this topic (eyes have been uncooperative lately), but I'd like to put in my two cents worth...
My favorite gun, bar none, is my 14 bore custom English trade gun / fowler. Roy Stroh made it for me with a 48" Custom Flintlock Inc. tapered barrel, and I swear it shoots like it's choked! So far I feel very confident putting a killing amount of different sized shot into the kill zone of most critters at longer distances than I would've thought. (I can kill cans with #4 or #6 at 50 yards, but then they don't move too fast...)
With .660 round ball I can confidently kill a pie plate at the same distance or a little farther. And please bear in mind that I am no Arnie Oakly by any means. Decent shot, I guess, but not a great one.
For my money, I've got one of the best all around bore and barrel lengths. I can load it up or down, send a lot or little lead, swing it easily, and the four foot tapered barrel gives me the sight radius and slight choke effect that I really like.
I like my other smokepoles too, but if I were to keep only one, this would be it.
Best of luck with your choice.