PSG and Madrid will offer so much money in terms of wages and fees that he'll basically be taking a pay cut to go anywhere else. So I think they are the two clear favorites unless he shows a genuine willingness to prioritize project over pay somewhere else.
If the club and project is more important, I think its City, Bayern, United in that order right now. That could change of course depending on the results of the season. City have the combination of competing for the top trophies every year, playing in PL, and his father's connection to the club. Bayern compete and win big trophies every year, but he may want to leave the Bundesliga. United have yet to show they can compete for the big trophies again and also there is the issue with the father's history, which I don't think would be decisive but is probably a small negative.