As others have stated....You can taylor your load to the rifle better with loose (of course then you have to decide on Pyrodex, Goes, Triple 777, American Pioneer etc)....I have buddies that use the pellets and they work fine, especially with 209 primers, they split a box every other season or so...I still shoot either Pyrodex or Goex, because I also have 2 flinters I always have a good supply of Goex around...
My Knight Disc preforms best with 90 grs of Pyrodex RS or 90 Grains of FFF Goex....
If you don't mind the extra cost per shot with pellets and think they are easier to use, there is nothing wrong with that....