Marshall.
No one in the MAC other than Miami matters more than the others.
100% Agree with Marshall. If they are on the home schedule, it is the first home game I circle on the calendar as "can't miss" along with the Homecoming game.
However, if we're talking only within the MAC, I give fairly equal weight to BGSU as I do Miami. I think it's safe to say we all have a number of folks we know personally that went to BGSU, which adds to it. More importantly, they've consistently become the team Ohio has to go through to win the MAC East.
I've said it before, but my feeling is that the Miami rivalry has lost luster, simply because their football and basketball teams have been bad for awhile.