I did a little check and Kim at Baylor is winning 95% of her games in the B12 over the ten years, Muffet at ND had a similar rate in the 6 year period she was in the ACC so they both had better conference win percentage than Geno against their conferences (but only because Uconn lost to their specific teams during the same time frame.) Tara and Stanford almost matched Uconn against the Pac.
Fact is the best teams generally stand well above their conferences often compiling undefeated records in conference play. The Big East at times with ND Louisville Rutgers Syracuse and Uconn was an exception. Other conferences have been competitive with a few teams for a few years at a time but Baylor, Stanford and TN dominated with TN being replaced by SC more recently. Not sure what to think about the Pac the last few years - it looks like maybe Stanford is reasserting itself there after a few years of wobble. And the ACC has been dominated by the old BE teams until recently, before that Duke.