I think Bayern Munich has more chances than other teams to win the Champions League because of their current situation and the current players they have in the team.
Bayern Munich's forward line has players like Harry Kane in the team and this can be definitely dangerous for any team, I think Bayern Munich's chance for this season is much higher than other teams.
But regarding Manchester City, I  can't be sure because they couldn't have good performance since the season started and they have yet some key players not in the good for in Manchester City.
Regardless of these two teams, I think Real Madrid is the first hope for the Chmapnis League just like all other seasons.