Between Manchester United and Tottenham, I'm more confident Manchester United can bounce back easier next season. Both teams will certainly overhaul their squad depth, and that process has already begun. If Tottenham were to keep Ange Postecoglou as manager, their chances seem better than Manchester United. No disrespect to Thomas Frank, and honestly, Ruben Amorim doesn't deserve praise just yet either. Both managers need to prove their capabilities next season, and we know both teams will be aiming for a top four finish.
Yes, from my observation I also feel more confident in Manchester United improvement next season than Tottenham. Looking at Manchester United's squad, despite the fact that they are not in good form this season, it is very possible for Ruben Amorim to fix things in the team very soon, even without making many changes in the squad.
Tottenham also has good players, but I would not say they are as good as Manchester United players, and that is one of the main reasons I now have more confidence in Manchester United than in Tottenham. However, if Tottenham can sign more great players before the season starts, I would say they may perform better. In fact, if Tottenham does not sign more quality players to strengthen the team, it may not be easy for them next season.
But it would be better for me not to fully conclude that Tottenham may not do better than Manchester United next season, because this is how many people built confidence in Manchester United to win the Europa League and in the end, it was another story.