Used Remington Sluggers for years out of various smooth bores. Tried others but always went back to them until a couple years ago when I tried Brenneke KO's. Consistent patterns tightened up just a tad so I switched to them. But if I had to go back to Sluggers, I wouldn't sweat it cause the difference was minimal.
That being said, agree with trying different slugs and using what your shotgun shoots best.