Arsenal has a good chance of winning that competition
But it will take Barcelona to beat Man United finally before they start talks of the next game
Juventus are still Italy giants in some past years they are good winners and knows how to win
I think that any team has the same chance. Just because some did well in the local league and it doesn't mean the rest were bad. Arsenal can be beaten anytime as well as barcelona as the most favourite team to win europa league. You shall not underestimate another team in europa league.
There are some worthy team like MU and juventus which can give you surprise anytime. The result is still remain unknown until the europa league will continue. I think that any team has same chance to win the trophy for now.