Statistically, Bayern Munich's chances of winning the match will be much greater because they are playing at home. But even so, we cannot ignore Arsenal's growing abilities this season, but what makes me a little doubtful is that they will not be able to face the pressure put on by Bayern Munich because after all, Bayern Munich will play better when the match takes place at home. Many surprises will happen in the second leg, Manchester City are favorites to beat Real Madrid at home, but I am still quite sure that Real Madrid have learned from last season.
It is in theory that a team which plays at home will have a higher chance to win the match. But in reality, sometimes the opponent which can play better because they have no pressure from the home base fans. Arsenal played better in Leg 1, it can happen again in Leg 2 although it will be at Bayern home. I think it will be about the tactics and mentality of the players. Which coach who choose better tactics and can motivate their players well, they will have bigger chance to win. Sure, Arsenal is a strong team from EPL, they won't be easy to defeat although they are playing away.
For the match Man City vs Real Madrid, Real Madrid is a very experienced team in UCL. It won't be a very big problem to play away. If Ancelotti can choose the right tactics, they even can have a better chance although they will play at Man City home. Real Madrid knows well how to play with a confidence although it is in the opponent's home.
Likewise with Barcelona and even though many people had doubts before, they managed to make conditions better. What's interesting I think is the match between Bayern Munich vs Arsenal because the two of them had quite fierce competition in the second leg. If Arsenal fail then they will always be said to be unable to face Bayern Munich, this has happened like several previous seasons.
Yep. Barcelona showed to people that playing away is not a problem for them. They could beat PSG in Leg 1, it was in PSG home. They even could score 3 goals in PSG home. This can be also happened in the match of Bayern Munich vs Arsenal and Man City vs Real Madrid.