This trio is strong on paper. Yes, let's say if you take Neymar from the time when he tried, the young Messi + Mbappe with a stable psyche, when he was not yet mired in money and jealousy, then it would be very cool. But in the existing reality, Neymar is good, but not as when he was considered the future undisputed top 1, Messi is old, and Mbappe is unstable due to many reasons. I don't like both of these clubs, but City >> PSG without a doubt.
I favored one of the two in the Champions League this season, but Manchester City tend to be better in terms of teamwork. Neymar, Mbappe and Messi haven't always been good in some match this season, it's true all three are good on paper but I don't like the selfish attitude of some players.
I see something different about the Manchester City strikers, they have a great team and so far Pep Guardiola has been able to keep his players from being selfish. I get it as a plus point, that would be very much expected by every team although individual achievements are also important for a player.