To be honest, I don't really care who will qualify from the match, but based on the data and several considerations, I support PSG to qualify for the next round. They have quality in their players, they also have good experience in the Champions League from their coach.
However, Real Sociedad performed quite well in UCL this season. They never got a lose in the matches of UCL group stage. They even leads the group D, it is impressive to see their achievement in UCL this season. This is something PSG will have to be wary of, they mustn't underestimate Real Sociedad because they played well in UCL.
I also don't care which team to qualify, both are good teams. But PSG should have a better experience in UCL.
But all of this really only serve as weak indicators of which team is better than the other and would hence go to the next round. We have seen plenty of surprises over all those last few months in all competitions. In the Cups, in the UEFA competitions, in FIFA competitions, in domestic leagues. I could mention plenty of great examples where the current position in the table meant nothing for the outcome of the game.
That's why the second part of what you said is important. Real Sociedad had by far the best defense in the Champions League and this is impressive. I think this game will be highly interesting and since I like Mbappe, I would wish for him to make it into the next round.