Nobody really "knows" what is going to happen, there is no reason why we should argue about any of this, we are just speculating, just like crypto prices. We can guess that Real Madrid will win because they are the better team and that should be clear enough to make them favourites and have them be wagered a lot more than Arsenal or even a tie. But that doesn't guarantee their win, so people who say Real Madrid will not win are also right as well, because there is a chance that might be true too.
So do not argue with each other on this, you could see this being a very true deal or a very wrong one, you have no idea which one will happen, so no reason to have heated arguments over it. Just bet whatever you personally feel like it.
Champions League is a very interesting league and it has a very spectacular games. Real Madrid are like a team who are made for this champions leagues games, they always have luck on there side. And not just the luck they know how to play in the Champions League, it always seems like they are made for this league. I will be anticipating what Arteta will have in his Arsenal to unleash on Real Madrid. But to be fair to Arsenal I just feel like Madrid is going to give them a game for their money. Gabriel getting injured and out of the season is a huge blow for Arsenal , because he is one of there best defenders. But it’s a game of football nobody can really be 100% sure of his prediction. So let’s see what the game brings