I also personally think that Barcelona is far ahead of Manchester United in terms of current performance. Barcelona coach Xavi is currently reaping the benefits of his hard work.
The assessment of each person for these two teams is indeed different and that cannot be denied. Because both are big teams in different leagues and obviously have a lot of fans, it is normal for these two teams to have a different assessment. Because Barcelona is also still possible to be defeated by Manchester United in the play-off round match and vice versa. So I personally find it a bit difficult to predict who will be the best among them. Especially in the Europa League play-offs.
I think fans of these two teams are looking the teams differently as if one is better than one when it comes to performance. These two teams are doing well, just that for a longtime now Barcelona and Manchester United have not meet and people just feel one is stronger than the other, atleast by the end of the match we can all see the performance of this teams and give accurate analysis from what has been seen from their performance.