It is the vehicle which will let us spread beyond Earth.
Super Heavy Starship is not only developing the largest and most powerful rocket in history, but SpaceX factories that will crank them out by the hundreds.
A fully and rapidly reusable super heavy lift vehicle will crush almost all other rockets. Placing 400 Starlink satellites into orbit per launch in which most of the cost is only propellant. Who could compete with that?
SpaceX has experience with human rating vehicles (Falcon 9 and Dragon) and they are fully committed to developing Starship to the point where they can launch crew starting with the Dear Moon mission slated for 2023.
1. When Starship deploys up to 400 Starlink satellites at a time. It will be clear that the heavy cargo capability of SLS can be provided by another system for pennies on the dollar.
2. if the Lunar Starship ever docks with Gateway, the size comparison with Gateway will appear silly. Two Starships simply dock with each other and transfer propellant from one to another.