even with that i still doubt chelsea will win

Chelsea always feels so difficult to beat United even when their opponent in the shitty season (h2h). However, they may get more motivation to keep UCL spot in their hand, and must get three points from MU. Three points from MU is very very very important to keep up their chance to qualify for UCL next season.
The odds literally says almost zero chance for MU to be up in this game, but often saw MU performed differently in the important game. They have to smash MU, or they will miss UCL.
When it comes to the Manchester United playing against Chelsea, everything about both teams changes and when though both of them have been experiencing one of the worst season ever, none of them usually wants to give in and allow themselves to get defeated. Manchester United have been really bad and as things stands, it looks like they don't have anything to fight for in the premier league but not untill they are going against Chelsea. Even if it means just stopping Chelsea from making it to the UCL, they will gladly ensure that happens. Both are in the finals and hopes to win the finals but Chelsea has an edge over Manchester United because they in addition to attempting to win the conference league can also get a spot in the next season of the champions league which is what Manchester United will be happy to spoil.
What are you saying mate? If Manchester united also win their Europa league final against Tottenham then they are the one with the most certain chance of playing champions league football next season and with the way they have been performing in the Europa league am not sure that they will manoeuver their way against Tottenham Hotspur but on record and stats in the past three seasons Tottenham have a better chance at winning them but hopefully they won't make history repeat itself. As for advantage Chelsea only have the home advantage in this game.