Big 10 vs. Big 12 since 2000
"The RPI ratings over that time span would definitely disagree with you."
You are correct. The Big 12 does have an edge over the Big Ten in the RPI ratings since 2000, though the margin is close. Here's what I came up with after comparing the two conferences since Jan. 1, 2000. I use 7 criteria when assessing a conference's strength: (1) Average Conference Rank; (2) Record vs. NCAA Qualifiers; (3) NCAA Tournament Winning Percentage; (4) NCAA Tournament Appearances; (5) Final Four Appearances; (6) Runners-Up Finishes; and (7) National Championships.
Average Conference RPI Ranking (source: CollegeRPI.com)
Big 10: 4.0
Big 12: 3.64
Edge: Big 12
Record vs. NCAA Qualifiers
Big 10: 631-990, .3892%
Big 12: 627-995, .3865%
Edge: Big 10
NCAA Tournament Winning Percentage
Big 10: 92-58, .6133%
Big 12: 97-60, .6178%
Edge: Big 12
NCAA Tournament Appearances
Big 10: 59
Big 12: 61
Edge: Big 12
Final Four Appearances
Big 10: 9 (Michigan State-5, Illinois, Indiana, Ohio State, Wisconsin)
Big 12: 6 (Kansas-3, Oklahoma, Oklahoma State, Texas)
Edge: Big 10
National Runners-Up
Big 10: 4 (Illinois, Indiana, Michigan State, Ohio State)
Big 12: 1 (Kansas)
Edge: Big 10
National Championships
Big 10: 1 (Michigan State)
Big 12: 1 (Kansas)
Edge: Push
Final Tally: 3-3-1 (push)
Miscellaneous
Head to Head in NCAA Tournament: Big Ten leads 9-7
2000: MSU over Iowa State; Purdue over Oklahoma
2001: Illinois over KU
2002: Indiana over Oklahoma, KU over Illinois, Mizzou over OSU
2003: MSU over Colorado, Texas over MSU, Texas over Purdue
2005: Iowa State over Gophers
2008: Purdue over Baylor, Wisconsin over K-State
2009: MSU over KU, OU over Michigan, Texas over Gophers
2010: Purdue over A&M
Head to Head in Regular Season (later): ???