SLS is, or was, the super-heavy lift rocket that was supposed to take us back to the moon. Designed by lawyers in Congress (”you’ll re-use Shuttle tech and keep my constituents employed no matter what”), it’s flown once and is projected to cost $2 billion a copy. Once Musk gets Starship perfected, he’ll have a better rocket that costs ... I don’t know, but I’d guess around 1/4th the cost of SLS per launch.
Thanks you!
Starship will not be ready for a moon mission for at least a decade at current progress levels
The main difference between SLS’s Artemis and StarShip is the former is light composite and the later heavy stainless steel.
The next difference is the Artemis is one shot to the moon, but Starship requires at least 5 refueling, due to its immense weight and fuel evaporation.