I personally believe that it would have been better for Sadio Mane to stay in Liverpool but I believe he thinks differently. Now I obviously think that he will do well in Bayern Munich but he might take a little time to get settled. I don't think Cristiano Ronaldo will be playing for Bayern Munich. And I believe Cristiano Ronaldo will stay at Manchester United.
Sadio Mane was the player that started the building of this new Liverpool side that are capable of winning what ever tournaments they're involved in. I feel he's undervalued at Liverpool just because Mo Salah is banging the goals. The media doesn't stress out enough how vital Mane has been to the Liverpool side therefore it's understandable if he wants to leave. I would have preferred him moving to Spain instead of Germany. There isn't much challenge in Germany as the league is basically dominated by one side.
In Spain he'll get more attention unlike Germany, and would be favoured to win more personal medal. Mane played a huge role in both defeat of Egypt in the AFCON tournament and World cuo qualifiers, and even if he had won the champion league i doubt he'll be ahead of Mo Salah in the race to the balon d'Or.