B12 officials are much worse than the SEC crews I've watched. I don't really watch much B1G football so can't comment.
The only thing I've noticed about SEC crews, is that they tend to favor the higher rated team especially when it's a traditional power. But, they've no doubt been instructed by the league office to do so, so I don't really hold it against their job performance. If anything, they're QUITE good at doing precisely what the league tells them to do.