Bayern 2013 treble team over 2020, definitely. Both were superb, but 2013 was just more well rounded imo.
I admittedly didnt watch 2012-13 that much outside of the CL because I didnt get Bundesliga on TV (and it was before streaming took off).
But I loved watching the 2020 team after Flick took over. High pressing, non-stop attack, and with their high line, I'm not sure I've seen a GK be so good and stop as many 1 on 1's as I saw Neuer that season. Neuer was spectacular for those 6 months, capped off with another great performance vs PSG in the CL final.
Debating between 2 treble winners over a 10 years span. Must be nice.
Although what's funny is, with the expectations under Flick from that half season (and for Bayern in general), I'm not sure there has been a bigger disappointment in football over the past 3 seasons than Bayern based on expectations since that treble win. Bayern with I think 3 straight eliminations in the CL quarterfinals, some embarrassing eliminations in the German cup, and Germany under Flick just hasnt worked.
But Bayern is Bayern and Germany in Germany and I'm sure they'll get it figured out.