It really depends on what you want to do. If you want the enjoyment of learning the ins and outs of a flinter, then a trade gun would be good. You can take deer, and you can learn to take turkey, but waterfowl are a no go. If you want a highly versatile, black powder gun, then the 12 gauge, caplock, SxS is the gun for you. The Pedersoli comes with Modified Choke/Cylinder Bore barrels, which gives you Turkey (left barrel). ducks (left barrel with bismuth), Deer (round ball in right barrel), and all the upland birds and the small game like rabbits and squirrels.
As for loads coming "loose" from recoil, that's not a real problem between shots, shooting one barrel followed by the other, and you can double check when you reload if you've only fired one barrel. You can also load them in such a manner that the shot column comin loose from the powder isn't a factor. A simple paper cartridge to hold the shot is one method.
LD