Benfica is currently last in group with two games lost against the weaker opponents of this group. They lost heavy away at Basel 5-0 and lost at home against CSKA Moscow 1-2. My bet here will be Man U to win the game.
I think to take Manchester united ML with a pretty high odds @1.85 it's like easy money. benfica have never won and has no points from two matches. While Manchester united were onfire.