I think PSG's defense is stronger than Barcelona's. Basically PSG's match strategy is very good. In addition to strong defense, PSG's attacking players are also able to attack very quickly. On the other hand, Inter Milan's players are also able to counterattack quickly. But I think both teams' targets in this match will be not to concede goals. We saw a lot of goals in the Barcelona vs. Inter Milan match. But we probably won't see many goals in this match. But this match will also be very exciting. This is going to be the first Champions League title for PSG if they can beat Inter.
I feel very bad for Mbappe. Mbappe left PSG to win the Champions League. He joined a giant team like Real Madrid. But Real Madrid was eliminated in the quarterfinals. On the other hand, PSG is now in the Champions League final. If PSG wins the Champions League title this season, it will be the most sad for Mbappe.
Inter Milan's defense was also good even though they conceded more goals when facing Barcelona in two matches because if noted this season only Barcelona was the only team that was able to break into more goals for Inter Milan's goal. PSG has a slightly younger player so they have the speed of attacking so Inter Milan must be aware of the speed of the players owned by PSG. If the scenario takes place like a match against Barcelona, Inter Milan players will suffer defeat and it is very beneficial for PSG.
It is a risk that has been taken by Mbappe and it will indeed be a little more sad when he goes PSG can get the Champions League trophy so that his name will be discussed. But in football this is natural and maybe at Real Madrid Mbappe will also get success in the next season.