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.