3 ms·

So in trying to answer your question I found this rather long-winded but nonetheless interesting and appropos link. https://everydayastronaut.com/sls-vs-starsh

• sbierwagen 6y ago
  I read that article all the way to the end, which was quite a slog. (You can definitely tell this guy is in the business of stretching out content to fit in more ad breaks) The conclusion at the end appears to be "NASA didn't see Starship coming at all, and built a very conservative, very expensive expendable launch system, that underperforms Starship on every metric". There is a logical next step, after you come to that conclusion... It is, of course, very reasonable to wait for Starship to actually launch and demonstrate a couple flights. But I would be very very surprised if SLS still exists in two years.