That pains me to say, since as a fellow ND alum, Joe's my hero.
Joe Montana is easily one of the greatest of all time. Had he not suffered that broken arm in the 1990-1991 season (thanks, Bubba Paris, for whiffing on blocking Leonard Marshall), I honestly believe that the 49'ers would have won those two matchups against Dallas in 1992 and 1993, as well as easily beating out the Saints and Falcons for the NFC West championship in 1991.
The 49'ers were the one team that could have taken out that Washington Redskins team that year.
I suspect he could have had at least two more Super Bowl rings if it weren't for that fateful playoff game in 1991 against the Giants.
However, in the end, Tom Brady has accomplished more. There's no question that Tom Brady has also been able to do more with less talent surrounding him.
For a lot of those Super Bowl games, he didn't have the best receiver of all time (Jerry Rice) in his receiving corp, nor were his WR2, WR3, and WR4 options as good either. John Taylor, Mike Wilson, and Mike Sherrard could have easily be true WR1's on almost any other team.
He didn't have a Roger Craig or Ricky Watters caliber running back for the bulk of his games either. The only skill position where he had a superior player was at the tight end, where Rob Gronkowski does deserve a higher rating than Brent Jones did, being a much superior blocker as well.