You can take another tack then - kilometers traveled (while in control of the rocket) multiplied by payload. This should be a more comparable metric, and the conclusion will be the same without the pesky 0: Starship tests have flown only a fraction of what SLS has achieved in its single successful flight.
Why do you think that's a more comparable metric? One of these rockets has flown one production flight, the other has flown 11 test flights. If you pick a metric that blatantly is measuring "production launches" you've decided the outcome before you look at it.
You're arguing with the same intellectual honestly of someone saying Starship is 11x better because it has left the ground 11x more times.
