Howdy, question for someone who's got experience with different types of slugs.

I've got a Shotgun smooth bore in 20 ga and have only tried Remington Sluggers and the Winchester Super-X, never had good groups with the Winchester, but Remington have gave some good groups up to 60 yards, but wanted to get a few more options in different slugs, I heard good reviews on the Federal Truball slugs and couple other types. I know I need to try a couple of brands and see what my shotgun throws better but wanted to get your view on what you like best.