this season it seems Barcelona is just much interested in winning the laliga. Manchester United have been well in the Europa league, they would like to still maintain their consistency.
Manchester United have been in the Europa League from the start, while Barcelona they haven't even play a one match in the Europa League. In my opinion, to assess the consistency of the two in the Europa League, at least we need to see Barcelona's performance in the Europa League first, it looks more balanced as a reference.
Barcelona has been played in a better competition than europa league before. Barcelona degrade to the europa league caused by it was not able competing in UCL. that proves that if barcelona is good enough but barcelona is not as good as another team in UCL. I think that even when barcelona has not yet played a single match didn't matter a lot as long as barcelona keep consistent against MU. MU has become the biggest problem for barcelona caused by this time MU is also performing so well under ten hag.
I expect the result will be draw or MU win the game. You shall remember once barcelona lost against frankfurt last season.