Of course, I am betting on Inter to win PSG because they are extraordinary and will fight till the end to make sure that they win the game. PSG performance this season is superb, but I don't think that they can outplay Inter to the extent of winning the match. Inzaghi will not let this season pass on without his men winning the trophy.
It's actually too early to say who the winner of this UCL final will be. I completely agree with you about Inter winning. But we must also remember that before competing in the final, both teams still have other fixtures in the domestic league and if Inter or PSG lose a player to injury, it will be a big problem. It would be better to see if both teams have any problems with their players.
This is why if you are betting, much better to have a closer look about the conditions of their players. Because having such knowledge will give you an edge on the betting lines. Because knowing the potential performance inside the field depends on the athletes themselves. So if you know that each member are actually in good shape or some of them are having some injuries, you would know your chances in the betting lines offered by the bookies.