Montana is the 2nd best QB of all time. If he played in this era he may have been the best
QBs now days have more control over the game than ever. Hard to compare
But you cannot on any level compare guys from 60s-80s who got hit to hell by defensive players with cheap shots. Knowing they would take a bearting when they dropped back was a different game Even when they got rid of the ball on time they got suckered. Had defensive players draped all over their receivers by grabbing all over them. Rules are way too different to compare
But I would take Montana over Manning all the time
And since Brady and Manning played in the same era it is an even easier pick to take Brady
How many great Qbs even changed teams and were bad? None? Not in the current era I would think