If playing better football than your opponent guaranteed that you would win against your opponent, there's no way Inter Milan would beat Barcelona in the semi final of the UEFA Champions League competition because Barcelona played better than Inter Milan, but Inter Milan used tactics to beat Barcelona at San Siro to proceed to the UEFA Champions League final. Paris Saint-Germain doesn't need to solely depend only on playing better football than Inter Milan in the final; they also need to deploy good tactics that will neutralize Inter Milan's defense so that they can beat Inter Milan in the final.
The PSG vs Inter final will be a tactical war between the two teams. In terms of game quality, both have good ways of playing. One tactic that PSG should try is to break down Inter's defense. We can see how Barcelona scored several goals when facing Inter. Some individual abilities of strong players in controlling the ball and being able to draw Inter's defense out will create gaps and spaces for teammates who are in good positions to score goals. PSG must prepare many things, because it will not be easy to beat Inter.