It's really not possible to say, since each sport plays a different amount of games during their respective season (from 8 home games in the NFL to 81 home games in MLB).
Michigan has the highest winning percentage and the most wins
The 1986 New York Mets had a record of 108-54 for the highest winning percentage in franchise history with .667.
That is Joe McCarthy who managed the Cubs, Yankees, and Red Sox between 1926-1950 with a .615 winning percentage (2125 wins, 1333 losses).
Miami has the highest wins.
Because they have the highest attendance and wins for home games.
The University of Notre Dame has the highest winning percentage during that time. They have had 875 wins, 305 losses and 42 ties.
The Chicago Bulls with a record of 6 wins and no losses, followed by the San Antonio Spurs at 4 wins and no losses.
It's about 56 - 57 percent every regular season
This question may have been asked out of jealousy. As an unbiased answerer, this is my observation. Generally, when a team of any sport, most recently wins the highest attainable accolade in the sport, they don't suck.
The University of Michigan; They also have the highest winning percentage--The Leaders and Best!
The person who has the the highest score wins.
The Newcastle Falcons compete in the division of lacrosse. They are amoungst the highest rating team. They also have some of the best scoring wins in their division.