Ferguson had one way of playing?
He played various different formations and variations at different times. 1999 team played 4-4-2, later teams played 4-3-3. Even in 4-4-2, he played with different central midfield and striker combinations depending on requirement. Keane went from box-to-box to holding midfielder. Irwin went from right to left back. Scholes dropped deeper as he got older. He man-marked Pirlo with Park in Europe.Cantona and Sheringham played more as a 10. Cole and Yorke played as pair of strikes. Tevez, Rooney and Ronaldo played as front three. Could go on....
Ferguson was not always a pleasant bloke, particularly when crossed, but he created and tweaked many excellent teams.
Guardiola is presented as some sort of genius when he had most success playing Cruyff tactics and with added "luck" of La Masia producing Messi, Iniesta, Xabi, Busquets, Pique and Puyol et al....