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We could deduce both of those at the same time. Enzo looks to be a better manager this season, we do not know what is going to happen next season neither, but Amorim failed so far, we should definitely give him some time before we judge him, but that doesn't mean we can't compare him, and Enzio is miles better than Amorim at the moment.
And if we compare the teams... well we do not even have to compare the teams because United sucked all season long, they are worse than half of the league already, and comparing them to Chelsea makes no sense. If we could consider this to be a very specific situation, then we can't really see how this could be sensitive, we need to realize this is quite normal for Chelsea to be considered better.
You are right, every manager needs time to build a squad and improve the team and sometimes this cannot be achieved in a season. Amorim is certainly a failure in the Premier League this season, as is Enzo Maresca, but both seem to be making a difference in the quality of their game that could see them survive into next season.
It is very difficult to change a team that has been in a slump for several seasons, many managers end up failing. Even if Amorim and Enzo Maresca were given a lot of money, I think they would also fail in their first season. Chelsea are better than Manchester United, but they are targeting something bigger. Enzo needs to be given a longer chance, he is good for Chelsea in my opinion.