It's a little more complicated than that, IMO, because it skews which division actually wins head to head.
If we take the top 3 teams for each division since 2014 it looks like this:
East
OSU: 72-7 overall
PSU: 54-22
UM: 51-23
TOTAL: 177-52, .773
West
WIS: 61-17
IOWA: 51-25
MIN: 44-30
TOTAL: 156-72, .684
Now, one could make all kinds of arguments about SOS, which division is weaker overall (since most games are played in-division), etc., but how to the East Top 3 stack up when playing against the West Top 3?
Since 2014:
OSU vs:
IOWA: 0-1
WIS: 4-0
MIN: 3-0
TOTAL: 7-1
PSU vs:
IOWA: 4-0
WIS: 2-0
MIN: 1-1
TOTAL: 7-1
UM vs:
IOWA: 1-1
WIS: 2-2
MIN: 2-1
TOTAL: 5-4
EAST 3 vs WEST 3: 19-6, .760
It's hard as hell not to argue that the East is a waaaay better division than the West, especially when a West team has never won the B1G.