The two most commonly named are John Unitas and Joe Montana.
Roger Staubach
Brett Favre
Tom Brady easily.
Tom Brady or John Elway.
Absolutely, one of the greatest of all time
Brett Favre is THE toughest quarterback ever. He is also the BEST quarterback ever.
Warren Moon, NFL quarterback between 1984-2000, fumbled 161 times during his career and holds the NFL record.
Jerry Rice. He was voted as the #1 player of all-time on NFL Network.
Jerry Rice
Yes...they are the greatest NFL Team of all-time and are considered to hold that Title. In addition, the Chicago Cubs have the title of greatest MLB Team of all-time, the Chicago Blackhawks have the title of greatest NHL Team of all-time, and the Chicago Bulls have the title of greatest NBA Team of all-time. Chicago is also considered the greatest city of all time.
Brett Farve
You can check out all interceptions thrown by an NFL quarterback on espn. You have to check out the quarterback statistics and can look at all of the seasons the quarterback played. You can also compared various quarterbacks together.