Actually, this match is difficult to predict who the winner will be. These two teams are equally good as they defeated my favorite team to reach the final. I see that PSG has indeed made a big change with a style similar to Barcelona, they seem more effective. I see them playing very differently under Luis Enrique. They paly very good in knock out phase. As for Inter, they tend to play more defensively, waiting to launch counterattacks. I think the pattern will be the same. Inter has also been good in the last 3 seasons, reaching 2 UCL finals. This means they have very good experience for the final match.
Inter often uses a defensive strategy, and they play more rough when the opponent is stronger than them, so in this case it is important which referee will referee the match, if he allows contact play then Inter will have an advantage, otherwise PSG will beat them, because their team is younger and faster and I think they have a better defense, which is very important. In the final I give preference to PSG, I think that this time they are very close to becoming champions, with Barcelona it would be much more difficult for them to achieve this.
Normally I would agree with you, however seeing their last two games we are seeing 3-3 results on both Barcelona games. Which is why it's definitely not something I would say for the time being. If we are seeing the normal strategy that they have, yes they are doing a great job defensively and all season long they did a great defensive tactic that looked a lot more focused on the defense than offense.
But if you look at recent games you are seeing that they are focusing on offense when needed and they are scoring at 90th minute type of attacking too. Barcelona was a bit more counter attacking team too, so maybe that was just two defensive teams clashing which made their offense a bit easier to handle and defense to be shocked about the situation. But in the end, PSG may do the same thing and not allow Inter to just park the bus.