Steve Young won three Super Bowls. One as a starting quarterback (XXIX) and two as Joe Montana's backup (XXIII and XXIV).
Tony Eason was the starting quarterback for the New England Patriots in Super Bowl XX. Eason was 0/6 in passing attempts. He was benched by coach Raymond Berry after the first quarter, and was replaced by backup quarterback Steve Grogan.
Mike Kruczek was the backup quarterback for the Steelers in Super Bowl XIV.
Super Bowl VI as a backup quarterback for the Dallas Cowboys.
Gale Gilbert was a backup quarterback for the Buffalo Bills for the four years they went to the Super Bowl and lost (Super Bowls XXV-XXVIII) and was the backup quarterback for the San Diego Chargers in Super Bowl XXIX.
Zeke Bratkowski was the Packers' backup quarterback behind Bart Starr for Super Bowls I & II.
Steve Young has 3 Super Bowl Wins - two as Joe Montana's backup, one as a starter.
Quarterback Steve Young of the San Francisco 49ers was named MVP of Super Bowl XXIX.Steve Young.
Mark Rypien. Jeff Rutledge was the backup.
Babe Parilli was the backup for Joe Namath.
given that the quarterback and its backup are out for season, I don't think so
Jim McMahon won a Super Bowl as the quarterback of the 1985 Chicago Bears. He later was on a winning Super Bowl team as Brett Favre's backup in Green Bay in Super Bowl XXXI.
Steve Young had 6 touchdown passes in Super Bowl XXIX.
Steve Young was a backup to Joe Montana for Super Bowls XXIII and XXIV and the starting QB for the 49ers in SB XXIX.
Easy, Montana won 4 Super Bowls as a starting quarterback and Steve Young won 1. So Montana was the better quarterback.