The matches against Barcelona showed that Inter's defense is not capable of withstanding a strong attack. Barcelona’s offense is very powerful, and they scored a total of 6 goals in 2 games. I think PSG’s attack is just as good, and they will also score against Inter. But when it comes to defense, PSG’s defense is much better. They have a very good goalkeeper, and Donnarumma could play a decisive role in this final.
But it also showed that their attacking is clinical and could score against anyone. We can safely assume that PSG will score, but we can also safely assume that Inter will score too. I am expecting a finals game where both teams score. And I am going to bet on that, I do not expect a boring finals game here, I am expecting one that will have plenty of goals. A good 2.5 over is not really that unlikely, I haven't checked the odds but odds for 2.5 over must be very little considering how likely it will be a game with plenty of goals.
In fact, I may go one further and do a 3.5 over goals as well, should be very tough, because difference between 3 and 4 goals is a lot, but it could very well happen. If you played 4.5 over on Barcelona Inter game, it would have been unlikely and yet it ended with 5.5 goals, so sometimes some games are very attacking.