Manchester City and Real Madrid have always been able to dominate their opponents so far, but you should not exclude Bayern Munich. This season, Bayern Munich is starting to perform better compared to last season, since Kane presence in the squad, Bayern Munich has found it easier to win. Real Madrid is always the favorite because of its status as the team that has won the most UCL trophies, but I still doubt Real Madrid quality this season. I'm still waiting for the moment of Real Madrid versus other big teams to draw conclusions, while Manchester City is no longer in doubt, let alone its status as defending champion.
So far there have not been any problems for Man City or Real Madrid in the group phase and both have packed full points in every match which has made them both lead in the standings. Bayern Munich is a little more promising this season than before and the arrival of Harry Kane has made their front line sharper, making them now one of the favorite German representatives to compete with Man City and Real Madrid.
I also want to include Inter Milan as the Italian representative who will fight for the title and finishing as runners-up last season will provide great motivation for them to continue to advance to the final this season. Even though it looks difficult, nothing is impossible because Inter Milan has a strong defense when they face a big match in the Champions League.