Going to have three would have 4 but I dont think Wembley should be inncluded in this list.
Old Trafford for all the history would be my favourite. The last time we played there we lost 4-0 to the then European Champions.
Before the match man Utd walked around the pitch with the Champions League, Premier League and FA Cup trophies.The Emirates is the best ground I have been too in the UK
The Nou Camp is a very special place.
Least favourite would be Oldham Athletic ( Boundary Park) , I have never been so cold watching a game of football. and we lost
Chelsea priory to the development was shocking,
I have always been amazed how bad Elland Road is