Big XII has only existed since 1996. the Big 8 was a mediocre hoops league (minus KU, the old timey OSU NC's and some KSU flashes was basically a poor man's Big Ten. slow paced games, physical, low scoring) until the 80's when it was then routinely sending 5 of 8 teams to the NCAA. Since 96, i think you could make a very good argument the XII is the better league. KU, OU, UT, OSU in the final four at least once. other elite 8's from those teams....and elite 8's from MU (2), BU, ISU (Eustachy blows it against Mich State and Cleaves?)...ATM, Tech, KSU in the sweet 16. that's pretty strong and balanced over that time period. off the top of my head...that's everyone but CU and NU in the Sweet Sixteen at least once.
i can think of UCLA and a couple U of A teams playing the last weekend of the Dance.....SC (Clancy, Trepanier, Scalabrini), Oregon (Ridnour, Luke Jackson), maybe one of those Mike Montgomery Stanford teams in the Sweet 16. Romar had a Sweet 16 i think.