Manu in 99. A lot will say bayern of 13 but it wasn't THAT good.
Bayern took back the Bundesliga dominance from Borussia Dortmund in Germany by demolishing them in the league table and beat them in the Cup QF to win that. They bulldozed us in the CL and won against the same BVB team in the final, which might have been the second best team in the World that season.
People forget Bayern were ending 10+ points behind BVB the two seasons before their treble. They didn't sign any superstar players in 2012/13 to get ahead of them and neither did BVB lose any important player. It was not an easy league back then like it is now. It was Borussia Dortmund at their peak vs Bayern Munchen at their absolute peak.
Meanwhile Man Utd barely won the Premier League, just one point ahead of Arsenal and undeservedly won against Bayern with two late goals. No way they were more impressive.