There are no "rifled choke tubes" that I know of... You can get guns with rifled slug barrels and they usually have fixed cylinder chokes. At any rate, if you're using a standard smooth bore barrel, then you want to fire rifled slugs, not sabot slugs. When firing rifled slugs, the more open the choke, the better. So, cylinder is the best. Definitely do not fire rifled slugs out of an XXFull choke, or the slug can get jammed at the muzzle and break your gun, and maybe hurt you in the process.