I think Barcelona have more chances of winning Manchester united. Barcelona has Lewandowski who can score some number of goals, this is an advantage for Barcelona. The game will be interesting, this are the big clubs in the Europa league.
Are there no other players you can talk about here other than Lewandowski at Barcelona? After seeing Lewandowski's performance at this year's world cup, I don't think there is more influence on a player like Lewandowski, even though he is a top player in Barcelona.
Indeed, in general, the strength of each team does not lie in its name, but always lies in its players, and Manchester United's players are not so bad this season, especially if they can have more motivation to give resistance in matches because they remember them (Manchester United ) will be against a big team like Barcelona.