In terms of the history of the club, how do you separate these historical moments against City - Ricky Villa's winner in the 1981 FA Cup Final replay or Peter Crouch's header to secure a place in the Champions League in May, 2010?
It's almost impossible - but you can have you say in the poll below!
In the meantime, we turn the clock back six years and Ledley King's memories of that famous night at the Etihad when 'Crouchy' headed us into the Champions League.
Aptly, Crouchy, who came through our Academy, went on to score a hat-trick in the play-off against Young Boys and the winner against AC Milan at the San Siro in the last 16.
Here are Ledley's memories of May 5, 2010...