but for me its got to be Man United Vs Celtic. This game is stooped in tradition, the battle of Britain - the first British Team to win the EC vs the first English team to win the EC. Both with great European Pedigree, even though Celtic have faultered slightly in the last couple of years, and United last season.
Celtic fans are some of the most passionate in the World, and in the largest stadium in Britain - Old Trafford (the Theatre of Dreams) - this is a mouthwatering tie for the neutral.
Both teams like to play attacking football, and with Rooney and Scholes back (I believe?) for United, this could be a cracker....
What other matches do you feel are worth a look for the neutral?