I'm not discrediting Peyton for his championships, nor did I say it was easy to win a Superbowl as a starter for two different teams. I just don't see why he somehow gets 'bonus points' for the fact that it was with two teams. Every situation is different...you referenced Montana who ran into Marino come the playoffs and Warner who did make it to another Superbowl.
The fact is that many Superbowl winning quarterbacks don't change teams, and more recently if they do, it was because they were traded and not always sent to as good a situation as Peyton was able to pick out in Denver. And honestly, that's fine...again, I'm not discrediting him for it...I just don't understand why it's somehow more impressive. If I wanted to, I could make the argument that Brady HAS won with two different teams, since no player from the 2001/03/04 championship run was still on the team for the 2014/16/18 run. Literally the only difference is that the uniform didnt change color and it was the same head coach.
If Brady was released and signed with that Denver team, do you think he would have won? If Aaron Rodgers was released and signed with that Denver team, do you think he would have won? Roethlisberger? Russel Wilson? There's a good chance of it, but as I said, most Superbowl winning quarterbacks don't get the opportunity to find a situation like that, so we just don't see it often.
Winning the Superbowl is freakin' hard, let alone doing it twice or more. I just don't understand why someone would get more credit simply because it was with two different jerseys.