I have a friend who is a Purdue fan and by extension is constantly trying to equate Big 10 basketball to SEC football. He ignores that most years, the 8 or 9 teams the big 10 gets in the tourney bow out the first weekend and they are lucky if they get someone to the final 4. I also love to point out that the last Big 10 champion happened before most current big 10 players were even born (2000). Though they are doing better than the pac-12 in that department as their last one was 1997.
Until the tournaments post-Covid, and now that the Big 12 is more than just Kansas+9 (and now 11), I would say your friend was right. Maybe not SEC football level since that’s usually one team way above the rest, but I would say they were the deepest conference. The conference just has a problem winning that sixth game. From 2001-2019 the conference had 24 more wins than expected by seed, double the next best conference (though MSU alone probably makes up a chunk of that) and seven appearances in the national title game.
But 2005 Illinois couldn’t finish their run against UNC. 2009 MSU ran into what was probably the best NCAA team of this century. 2013 Michigan now has a loss to a vacated Louisville title. Wisconsin was winning with minutes remaining against Duke.
By conference, national title participants since 2001 have been:
ACC: UNC (5) Duke (3), Virginia, Maryland, Louisville (vacated), Georgia Tech, Syracuse
AAC: UConn
Big 12: Kansas (4), Baylor, Texas Tech
Big Ten: Michigan (2), Michigan State, Indiana, Illinois, Ohio State, Wisconsin
Big East: UConn (2), Villanova (2),
CUSA: Memphis
Horizon: Butler (2)
SEC: Kentucky (2), Florida (2)
Pax 12: Arizona, UCLA
WCC: Gonzaga (2)
When you take into account that the ACC and Big 12 have largely been anchored by those three blue bloods, the Big Ten comes out as the “deepest” conference. Maryland, Cuse, and GT were all in consecutive years in the early 2000s, so post 2004, given Louisville’s vacated title, it’s only Virginia’s recent title that has kept the ACC from being all Duke and UNC. I didn’t realize Kentucky has only had two appearances until now.
Interestingly enough MSU has the last mens basketball title and mens hockey title for a Big Ten school.