First of all, that's very fast of you already wanting to dash the trophy to Manchester united, if anything first united should try to sort out their coaching and playing well problem before even thinking about getting their hands on the Europa league trophy because there are a whole of good teams and also teams from the champions league will also grace the competition with their presence after the group stages.
Manchester United will be one of the favorites to win the UEL. But we cannot place United in first place as the favorite team to win. They managed to win the FA cup but to be honest they were not the strongest team in the UEL and they also did not appear impressive in the League. United must be able to solve some of their problems this season to improve their performance next season. There are many other strong teams competing in UEL. And there are several teams from UCL that will play in UEL. Some teams can provide surprises, such as Atalanta who managed to beat Liverpool and Leverkusen and become champions. I'm sure no one puts Atalanta as the favorite to win.