Impact 22 you have to try 217 and 218 to see if your barrel wants one over the other. Then different velocities. New slugs coming in 22 cal will be 1/3 current 22 cal pricing roughly making it easier to on the wallet to get them tuned.
So far, the majority of the results show that pellets are more accurate than slugs. I've tried them myself and got the same results from my 22 and 25. What's the holy grail here? If appears that a slug gun must be designed specifically to shoot them and have a specific purpose. Overall, pellet shooters seem more versatile for most of us.