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.
Football is a game of probabilities just like how trading is, so we just analyse the games and chose the team that we best think will have the best chance to win this match. Champions league is a league of champions and I think no team can be looked down on once you are all meeting on this level, so looking down on another team will be a dangerous one to even think of. I am of the opinion that all teams are equal in the champions league regardless of their past records and until a game is played and we see the outcome, we can call one team superior to the other one.