Favre over Brady on all-time list?

On Twitter, @15min2exit pointed out NFL Network's Top 100 players of all-time ranking, making reference to spots 20 and 21.

20. Brett Favre

21. Tom Brady

That prompted @15min2exit to write, "Biased Pats fan, but they're not close. #Favre was always about risk, #Brady about calculated risks."

My response was, "I agree. At the same time, big-time respect for Favre's durability."

Today's question: Understanding that most who might visit this space have an interest in the Patriots, and would probably rate Brady higher, what are the things that stand out when comparing Favre and Brady?