I think Man United's performance is slightly better than Barcelona, where in their last 7 matches Man United always won, while Barcelona had to draw 2 times and win 5 times. Man United also managed to score 17 goals and only conceded 3 goals, while Barcelona created 16 goals and conceded 9 goals. The numbers above are not a guarantee for a victory because there are indeed other factors that have a big influence on a match. But those statistics can still be considered that Man United is currently having a better trend than Barcelona, and of course, they have a chance to beat Barcelona.