Manchester City only need a draw in the second leg to advance to the semifinals, a 2-0 victory in the first leg is the capital that must be maintained until the end of the match. Munich will be very insistent on finding goals in order to catch up with the goal deficit, Pep Guardiola has certainly anticipated Bayern mission of wanting to stay in the UCL.
In matches like this, I prefer to bet on the resulting number of goals in the match, as many possibilities exist for both teams. Manchester City could lose and still qualify, so taking a bit from the money line is a bit risky, in my opinion. Clearly, everything will depend on the beginning of the match as Bayern are required to score early, while Manchester City could benefit from the offensive attack or from Bayern's mistakes like what happened in Al Etihad Stadium. Therefore, if I decided to take a bit on this match, I would bet over 2.5, because Bayern won't give up easily.
In the first leg at the Etihad Stadium, I bet on the result of over 2.5 goals and my prediction was right in that match, even though all the goals were bought up by Manchester City, that was more than enough without having to risk betting on the victory of one team. But I quite agree with you that the second leg will probably still be very difficult to predict who will win and because I will again place the same bet as the first leg for a result of over 2.5 goals because anything can still happen for Bayern Munich to turn things around without underestimate manchester city though. Moreover, the second leg will take place at home to Bayern Munich, so the push for results to reverse the aggregate situation is still quite large here.