Current B12 vs P12 the legacy P12 is tougher if it stayed together.
Oregon - playoff bound and ranked #1. Legit contender.
Washington- played for the NC last year.
USC - down but can be good again.
These teams are above what we have in the B12.
ASU - B12 contender this year.
Colorado - another B12 contender.
There is not any B12 teams that I see competing in the playoffs or that have recently (I could be wrong).
Now if you added Texas and Oklahoma back in that is a different story. That was not the argument, it was current B12 vs legacy P12 and which is more difficult.