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SLS is not in competition with Starship, as this post[0] from Everyday Astronaut front page nicely outlines. [0] https://everydayastronaut.com/sls-vs-starship/

• WorldMaker 6y ago
  Thanks for the article, a lot of interesting details. They definitely are not in competition today, and certainly not in competition technically where they are taking very different approaches and currently have very different end goals. I was responding to the hypothetical situation of the above poster where if Starship comes in under budget and better specced than SLS in the Artemis timeframe for Moon mission lunar lander designs and the SLS teams came in with one over budget (and Sierra Nevada does whatever they do probably somewhere in the middle) ["all three plans"], the SLS is still likely to win in the political competition (for so very many reasons including those for why the SLS is nicknamed the "Senate Launch System"). Keep in mind the whole point of the Artemis "land a person on the moon again in our lifetimes" is a political gambit to curry favor with US taxpayers that their "money is well spent" with a pat on the back that NASA and probably (and maybe even especially) that the SLS have been useful uses of taxpayer money. (Even if NASA has done plenty of things between the last moon landing and today, and even if NASA is just as equally involved in the commercial space projects, Artemis and SLS are as much political symbols as space projects.)