I can't predict accurately which team to win among them though but I still think Manchester United stand higher chance than Tottenham even with their poor performance. If Manchester United is said to be bad, then Tottenham will be the worst but you know the irony of football, anything is capable of happening.
Both team happened to be in a bad shape in the premier league, with spurs one place ahead of getting relagated , and Man U at their 18th loss this season. Amorim is said to have rested players prior to the Europa league final, and they happen to be the favorite. However, who wins isn't what matters to me, the fact that one of these EPL losers will have a chance of going to the Champion league, only will get sides like NFFC wondering why they've worked so hard to have what was once in-between their lips and didn't gain it, while Man U or spurs that had it placed in-between a mountain has more opportunity of going there.