Inter is way on the different level. They beat the winners of La Liga and Bundesliga that can't be compared with PSG, which was beating the weaker teams than them. So, it totally makes sense to argue Inter is clearly a bit better, though the odds said the opposite. It only reminds me with Europa League final when Tottenham gets bigger odds, but win its first european trophy.
Your analysis is flawed. If you want to look at it that way, PSG also eliminated Liverpool, which happens to be the English champion. However, none of this is important. The final game is a feature between two good teams and a winner will emerge. Inter Milan may have the edge because it has won it before and has more experience in the competition, but PSG has also been amazing this season and I'm not writing them off.
Yes you are right, some people are just saying inter Milan will win PSG because they defeated Barcelona, for me I don't see that as a good reason for us to conclude that inter Milan will win PSG, yes inter Milan is a strong team so is PSG too and just like you said sokani PSG also eliminated Liverpool and Liverpool is a very strong team too.
When Barcelona and inter Milan played, before the match a lot of people where saying Barcelona will win inter Milan but everyone where shocked and surprised on what happened so till the final day I can't concluded on the team that is more stronger, so let's just wait till that day.
The match will be an interesting match and everyone will watch it but when it comes to betting on it there will be a lot of confusion but for me I'm predicting and betting more than 2 goals in the match.