For turkey the Knight would be very hard to beat. I had one and the patterns were awesome. 100 to 120 grains of T-7 behind 2½ oz of shot is deadly (on both ends of the gun, that's why I say had one ). The stock dimentions and fiber optic sights are designed for slow deliberate shooting, so it wouldn't be as good for ducks & upland game.
For shooting ducks or upland game I believe I'd go with the CVA if I was limited to the two choices.

Actually, I sold my inlines and added a 12ga barrel to my T/C NewEnglander. A lot more versatility and it fits me well. Not quite as much range as the Knight, but it makes it more fun to have to get a little closer to the turkeys.