Non-returning is obviously a superior attainment to once-returning.
And yet, the once-returner comes back one more time as a human being and attains Nibbana, while the non-returner is reborn in the pure abodes and stays there for eons before attaining Nibbana.
So it seems, if I understand it correctly, that it takes the once-returner far less time to attain Nibbana? And that would mean once-returning is the preferred option since one will escape samsara far sooner? Or have I got something wrong here?