Diff guns like differnt things.Some shotguns will shoota Modified like an Xtra full and an IC like a skeet tube. Lots of effect for only a few thousanths difference. You are going to have pattern the gun with both and see what gives you the nicest, most even pattern at the approximate distance you will be shooting. But, it will be either IC or Mod. Don't fool with full, even you can shoot steel through it (most full chokes from the factory, you can't or shouldn't), you'd likely just be wasting time with the full. IC or Mod, the patterning board will tell you.

Good luck.