Yeah, commonly PSG dominates in the first half, but I believe Chelsea is well-prepared for that. If they manage to withstand PSG's early pressure, the second half could be where the real action happens. I expect Chelsea to adopt the lightning counter-attacks, looking for any gaps or mistakes in PSG's defense. If they can disrupt PSG's rhythm, we might see some surprising moments from Chelsea.

One edge PSG has above most of the opponent they have played against us that there's this sense of unity in the PSG team that makes them play too well and sadly get good result against teams that are a bit disorganised or that plays a little bit of individual football. The pace to play very fast from defense to attack and utilize every goal scoring opportunity is what real Madrid couldn't cope with since they where already struggling to play together as a team.. when they go against Chelsea, this is going to be what will make the game a bit interesting because if Chelsea can also maintain Thier energy level, it will be possible for Chelsea to go at them edge to edge and still make things difficult for PSG.

In of the team that deserves to win the FIFA club world cup more, PSG is that perfect team but because of how football can just suprise us sometimes there's a level of hope that something contrary to the popular opinion can still happen on Sunday night.

PSG will not find it easy to score goals against Chelsea because after watching how they defeated Real Madrid, Chelsea coach must have done some assignment by taking time to study their game play before analyzing it to his players so that they can learn how to stop them from attacking team and scoring goals. PSG is in the better position in winning the match against Chelsea but Chelsea will not concede up to 4 goals because they have a working team at the moment but if they fail to do their home work very well then we may see exactly what happened in the champions League finals between PSG and Inter Milan repeating it self again. PSG is on fire and can defeat any they come across right now I don't think Chelsea can stop them.

If Paris Saint-Germain, who scored four goals against Real Madrid, plays as flawlessly as they did against Real Madrid, they'll score a similar number against Chelsea. However, I'm sure over 2.5 goals wouldn't be enough. If Chelsea wants to win the final, they need to take the match to extra time, so in my opinion, Chelsea should play defensively. If they create open chances without playing defensively, they'll fall apart like Real Madrid. We're in a time when Paris Saint-Germain is a ruthless machine. They can tear any team apart.

PSG has always been an aggressive team. When they have scored 3+ goals already, they now go on full defense to not let the opponent have a chance.
If we look into the recent season in French and English league, the difference is starling. Unlike English Premier League, the Ligue 1 just have 34 games. In those 34 games, PSG conceded 92 goals. While the winning team of Liverpool in 38 match conceded 86 goals. While for Chelsea it was 64 goals.
There could be reasoning that Ligue 1 has less competition than Premier League, but what I want to justify is Ligue 1 is more aggressive than Premier League.

Paris Saint-Germain will do everything to win the match in the first half, it's easy for them to do it, it's simple for them to do it.
Every time they do it or try to do it they succeed, so I would say that it's now their tactic, trying to score as many goals as possible in the shortest time possible, so over 2.5 is a good bet.

I believe red cards could stop them, thus, their players will need to be extra cautious to avoid any unnecessary fouls,and at the same time be assertive themselves on Chelsia half. That being said, I do agree that PSG have the better chance of winning, especially if they score first. However, if Chelsea gets the opening goal, PSG's defense might struggle against Chelsea's pressure, which could lead to an unexpected result. Probably I will bet on btts along with total over 2.5.