I think it depends on what you want to accomplish. Do you want to win, or to be canonized? I think Notre Dame is the better job.
At Texas, in theory at least, it’s easier to win, but the fan base is delusional, and the administration and boosters widely perceived as too controlling for their own good or to attract a Saban. They think they’re a premier program, but in reality they’ve only won four titles, and only one in the last 50 seasons (requiring questionable play calling by Lane Kiffin on USC’s final full possession to set up UT’s opportunity). If not for an eight year run under Darrell Royal from 1963 to 1970, UT historically is basically indistinguishable from TAMU, or a modern day version of Minnesota - once relevant, but you have to have reference material to be certain exactly when.
ND’s fan base (I frequently read, and occasionally post on, NDNation) and administration are generally resigned to the belief that a year like 2020 is as good as it can get for them. Their administration puts transparent limits on recruiting, basically requiring that a kid can get accepted as a normal student, and that’s what I assume Brian Kelly was subtly saying in his post game comments - I can’t compete at skill positions with ND’s recruiting restrictions, so if you want to take the next step, you need to help me. I’m not sure I believe that. If ND in 2005 had hired Meyer or Saban, and either had stuck around awhile, does anyone believe ND wouldn’t likely have won multiple titles from that day to this? And if you think Saban is immortalized for having returned Alabama to glory after a mere 17 year drought, imagine the canonization in store for the man who returns ND to glory after double that span.
Saban’s hiring at Alabama - a once in a lifetime hire for any AD, and for most fans not named Earle - was a combination of preparation (Mal knew who he wanted), opportunity (Saban was ready to move after the Drew Brees fiasco), and the unintentional beneficence of Rita Rodriguez. To make a similar hire, the ND administration needs to have and communicate a vision that simultaneously embraces the uniqueness of Notre Dame and expects to win championships; for as was once written somewhere, where there is no vision, the people perish...