I don't know. Playoffs do not reward the best team. Instead they reward the team with the best current form. Playoffs are for entertainment purposes only so of course American sports usually have lots of divisions and playoffs and other fun activities but they are anything but fair. I would bet that the best team in the nfl only ends up winning the superbowl 40% of the time.
An NFC team has won the Super Bowl 21 times if you only count the wins after the NFL/AFL merge. It is 23 times in total for the whole NFL/NFC side.
Only the 1972 Miami Dolphins have won a Super Bowl with an undefeated record.
The 2007 Patriots went undefeated for the entire season until they lost the Super Bowl to the Giants. Unless you meant to ask what team has the best win-loss record in the history of the franchise, but has never won a Super Bowl, that would be your answer.
San Francisco 49ers
The Pittsburgh Steelers have won a record six Super Bowl championships.
The Steelers have won the Super Bowl 6 times.
The Miami Dolphins won Super Bowl VII after posting a regular season record of 14-0.
The Colts best record with Peyton was 15-2.
The Patriots Super Bowl record is 3-3
5 times (4-1 record).
dallas cowboys
As of the end of the 2009 NFL season,The Pittsburgh Steelers have won 6 Super Bowls. They have been to the Super Bowl 7 times and have a 6-1 record.
5 (4-1 record).
No National Football League team has ever lost the Super Bowl seven times. The record for most Super Bowl losses is five, held by the Denver Broncos. They have won twice.
The Miami Dolphins, with a 17-0 record in 1972.
The Denver Broncos have lost a record five Super Bowls. They have won three times.
Team with highest Super Bowl score: The San Francisco 49ers scored 55 points in Super Bowl XXIV (1990) defeating the Denver Broncos 55-10. Teams with highest combined Super Bowl scores: As of 2011, the most points were scored in Super Bowl XXIX (1995). The 49'ers played the San Diego Chargers and won 49-26. The 75 total points is a Super Bowl record.
Only the 1972 Miami Dolphins have won a Super Bowl with an undefeated record.