Sir Alex Ferguson managed Manchester United for 26 years and won 13 Premier League titles and two Champions Leagues. No single team did all of that. So picking his greatest XI is really an argument about which era you loved most, which is exactly why people never stop having it.
The spine that picks itself
A few names go on the team sheet before the debate even starts. Peter Schmeichel, the goalkeeper who made the 1990s side fearless. Roy Keane, the midfield engine and captain. Paul Scholes, the passer every modern great namechecks. Ryan Giggs down the left for two decades. Cristiano Ronaldo, who arrived a trickster and left the best player in the world. And Eric Cantona, the signing that turned contenders into champions.
Where the arguments start
The defence is a fight. Gary Neville at right-back is hard to dislodge, but the centre pairs off in eras: Steve Bruce and Gary Pallister from the first title sides, Jaap Stam at his peak, or Rio Ferdinand and Nemanja Vidić, probably the strongest pairing of them all. Denis Irwin, the quiet constant, usually takes left-back.
The number nine is the other great row. Cantona is the romantic pick. Ruud van Nistelrooy was the most ruthless finisher. Wayne Rooney is the club's record scorer and could play across the front. You cannot fit all three, and dropping any of them feels wrong.
A defensible XI
If pushed: Schmeichel; Neville, Ferdinand, Vidić, Irwin; Ronaldo, Keane, Scholes, Giggs; Cantona, Rooney. That leaves out Van Nistelrooy, Bruce, Stam, Beckham and Cantona-or-Rooney purists will fight you over it. Which is the point.
Why it matters
The fact that this XI is unsettleable is the real tribute. Ferguson did not build one great team. He built four or five, tore them down at their peak, and rebuilt before anyone else saw it coming. The argument over his best players is just the argument over which of his dynasties was the best, and that has no answer.