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The history that cannot be denied is about PSG who have never won the Champions League until last season, although for this season I personally still can't be sure. And for the match between PSG and Aston Villa, almost everyone will favor PSG as the team that will advance to the next round, but that doesn't mean we should think that Aston Villa is weak because it could be that the team will prepare a clever strategy to be able to beat PSG in the quarter-finals this time.
Almost everyone would say PSG are favourites to make it to the semis, but you are right, Aston Villa are not to be underestimated at all. It is not always the case that favourites can achieve their goals, but this season I see PSG differently. They are improving quite well and they seem to have the mentality to beat anyone, so I am optimistic about their chances of making it to the semis.
Besides PSG, I think Real Madrid who has the most fans is also the favorite to advance to the semifinals. Arsenal could be a threat, but as a team that is experienced enough and has a strong mentality, Arsenal could lose in the quarterfinals. I admit that everything could be different, but Real Madrid is still the favorite. If this scenario is correct, then PSG will meet Real Madrid in the semifinals, if I am not wrong.