Man United go into this huge FA Cup tie in fantastic form, top of the Premier League and 14 games unbeaten in the league. Liverpool by contrast have a stack of injuries, they are misfiring by their own high standards, and in the week they lost their unbeaten home record of over 50 games in losing the lowly Burnley in a 1-0 defeat.
If you were to go on form alone, then Man United should be the favourites, but this is the FA Cup, this is a local derby and and in football, anything can happen. Who are you picking to go through to the 5th round?
By the way, in 13 previous meetings between these northern giants, Man Utd have won 4 times and Liverpool have prevailed 9 times before & the last time they met in the FA Cup was in 2012, with Liverpool winning 2-1...