Funny rivalry, Liverpool and Manchester United. They are English football’s most successful clubs but there’s rarely been a moment in history when both of the clubs were competing against each other to be the toppermost of the poppermost. To use the pre-cancellation phrasing of former Stretford Ender Stephen Patrick Morrissey, the north-west giants oscillate wildly. Give or take the 2008-09 saga of Rafa Benítez’s “facts” and Kiko Macheda’s dance moves, and a 1995-96 campaign when Roy Evans’s men-in-white-suits party boys couldn’t keep pace with the Neville brothers’ early nights, you’d have to go back to the era of Shankly and Busby, the Beatles and the Hollies, for both clubs as the best around.