My gut feeling tells me PSG is going to be the finalist, but who knows what Arteta will do on the second leg. Playing away at PSG is hard, especially if they can't control the midfield. On the other hand, Arsenal managed to defeat Madrid in the away game, so that's a good experience to hold on to. I guess it depends on how much the players want the UCL title, considering it's the only title Arsenal realistically can win while PSG is hunting for a treble. CMIIW.
I agree with you even I am not a fan of PSG or Arsenal but I saw something different in PSG this season. They knew what to do in big matches and were coldly enough to make it done. They already won in London against Arsenal and will be ready to host Arsenal in Paris with similar tactical approach like Arsenal did in Bernabeu weeks ago.
Pressure of mandatory win in Paris will force Arsenal playing attacking in Paris, and PSG are experienced and good enough in counter attacks to beat Arsenal in a second match. They have very good advantage to apply their dangerous counter attacks with Dembele and Kvaratskhelia but they will need better performances and shots from central striker to eliminate Arsenal.
If we are the ones who follow Paris Saint Germain's journey when they are in the Champions League, then we will see something different. The first thing I see is that the teamwork between them is now getting better, that is a change that is quite visible from them.
Now if we look at how selfish the Paris Saint Germain players were before, especially when they had many star players, then this time the players have been able to suppress that so that it creates good teamwork as I said before.
With what they have shown, it is not impossible that they will create history in the Champions League.