Bayern Munich also lost when they faced Aston Villa so the strength of the two teams is not that different in my opinion. Barcelona's chances of winning are much greater even though Bayern Munich are in much better overall condition.
Honestly, the strength of Aston Villa and Young Boys cannot be compared. Aston Villa is clearly stronger this season and Bayern Munich lost when facing them while Barcelona won big when facing Young Boys but lost when facing the league 1 team Monaco. In my opinion, the strength of Barcelona and Bayern is not equal. I think Bayern is still quite superior in the UCL at this time. I think Bayern Munich will probably beat Barca's troops later.
Both have performed well with their new head coach this season, Flick also knows the quality of Munich players partly because he was there and Kompany must be very fresh in his strategy, and I think both have stable strength, playing in Barcelona is not easy especially a team that is under construction even though Barcelona rarely wins against Munich at home I think it is not impossible for Barcelona to take revenge.
I think in the continuation of the Champions League by meeting Barcelona Munich will be very fierce, it will be different from when they faced their previous team because they have deep memories of both and I think this match will be fierce, it is difficult to determine who is the best at this time.