fact Atletico and Manchester United have never played in any tournament so far, so there is no head to head record for this match. History is not an exact benchmark, because of the different situations, conditions, squad and many other factors that will certainly make the past not the same as what will happen today and tomorrow. We just need to make sure the team's recent performances are clear, Atletico is in decline and vice versa, Manchester United which keeps getting better then at least it promises something good for Manchester United and not just about 1 or 2 players.
Comparing these two teams, I think Manchester United is a strong team. Atletico Madrid is not playing well. Their position in La Liga is also very weak. They have lost their last 4 matches in La Liga. Lost form in a very bad way. Atletico Madrid have no hope of winning the La Liga title. However, despite the improvement in performance, they will not be able to beat Manchester United. United are a very strong team.
We say United is a very strong team, but we should not forget that they lost to Young Boys. In football, anything can happen. Likewise, it should not be forgotten that Sheriff beat Real Madrid in Spain. Atletico Madrid is not as weak as the Sheriff. They have players who will change the fate of the game in an instant. I don't have a favorite team in this matchup. The better team in that match wins.