Creighton was established before Altman, they had a lot of success under McManus, Eddie Sutton, and Tony Barone (multiple Sweet 16 appearances, and that was back when only 25 teams made the tournament). They went through a tough stretch in the early and mid 90s at a time when Nee had success at Nebraska. But overall, they have always been a much more successful program than Nebraska. Nebraska has never had any sustained success, just a few decent seasons overall mixed in with many mediocre to awful seasons.