Arsenal is a young squad and they have very little experience playing in the Champions League and this is Arsenal's first experience playing in the Champions League under the coaching of Mikel Arteta so it is very possible that they will have difficulty facing Bayern Munich who not only have a lot of experience here but also their squad is more experienced. playing in tight competitions such as the Champions League and they have been champions in this competition several times.
Arsenal is a team with mixture of young and experienced players. I don't call players like Kai Havertz, Jorginho is young, they are actually experienced players. Young players in Arsenal are actually no longer too young, it's true to say so two or three seasons ago but now, it is no longer true.
Bayern Munich will certainly consider Arsenal as a tough opponent because underestimating the opponent will only put a strong team off guard which will be easy for the opponent to take advantage of later.
Bayern Munich are one of most successful clubs in Champions League and this squad they currently have in this season are a strong one. They got some problems in last two months and fail to compete with Leverkusen in Bundesliga. In Champions League, since quarter final round, with knock out matches, and with star players they have, Bayern Munich can beat any opponent includes Arsenal.
Head to head stats between Bayern Munich and Arsenal actually is skewed on Bayern Munich with higher win rate. These coming two quarter final matches with Bayern Munich will be very big challenging tests for Arteta and Arsenal players.
I agree with you that Bayern Munich is one of the most successful clubs in this season's UEFA Champions League because they have won six UEFA Champions League trophies in the past few years. Bayern Munich is not consistent enough to beat any team in the UEFA Champions League; if Bayern Munich meets Real Madrid or Manchester City in the semi-final, Bayern Munich cannot defeat any of them because they are more consistent than Bayern Munich this season.