Bayern have the third most champions league trophies and the most quarterfinal’s in the tournament oat. The one thing that’s underrated about Bayern imo is their consistency. Bayern are almost always better than Barca and ac Milan (other second best contenders) and are always ucl favourites due to their yearly performances. Their fan base is the one of the largest in the world (+ the club with the most members), they have legends in every position (some in contention of best in their position I.e Neuer), the culture, the atmosphere.
I may be biased as a Bayern fan however I believe Bayern > Barca and AC Milan
While AC Milan has the second most UCL trophies, they have like half of Juventus’ Serie A trophy count or something. And for Juventus it’s the opposite: dominate Italy, lose in Europe. Liverpool has the majority of it’s success in 1970-1990 2 decades. I would say that though with less UCL trophies, Manchester United is above them with quality/quantity of legendary players, and more recent success 1990-2013. Yet they have don’t have as much UCL success compared to AC Milan, Real Madrid, Liverpool, Barcelona, Bayern, Ajax. So yeah Bayern Munich is clear of any of these teams in my opinion. Real is the unanimous 1st place. As for second it’s either Barcelona or Bayern Munich.
Barcelona had a massive bump due to Messi. It remains to be seen whether they can regain that same stature.
Barcelona had a massive bump due to Negreira. It remains to be seen wether they can retain the adulterated titles they won.