first of all, the tourney didn't have 32 teams until 1975, seeding until 1978, 40 teams until 1979, 48 teams in 1980, and 64 teams in 1985. based on this, anything before 1975 should be considered another era. with that, the 11 multiple title winners are and thus who is the best in order:
duke (6) 91, 92, 2001, 2006, 2010, 2015 - damn they are good, also lost 4 times
north carolina (5) 82, 93, 2005, 2009, 2017 - all should be vacated
kentucky (4) 78, 96, 98, 2012 - more final 4's than uconn so higher
connecticut (4) 99, 2004, 2011, 2014 - will never get to final four again
villanova (3) 85, 2016, 2018 - most dominate 5 year run and most dominant tourney in history gives them edge of three title winners.
louisville (3) 80, 86, 2013 - makes us #6 program
indiana (3) 76, 81, 87 - have done nothing for 20 years
kansas (2) 88, 2008 - toss up between next three.but i''ll go with ku
michigan st (2) 79, 99 - always seem good but never are
florida (2) 2006, 2007 - nothing since donovan left
ucla (2) 1975, 95 - nothing for 20 years
i don't think there's much argument until you talk of vacated 2013 then i still think we are better than iu and better than all two title winners. all other programs not mentioned are wanna be's