I'd rather think PSG will be winning the game easily. We should also remind how Enrique's squad totally made Liverpool became nothing. Can we think Villa to perform better than Liverpool to fight PSG? I don't think Villa can.
I also believe PSG will knock out Aston Villa but I don't think it will be easily. As good as PSG is they needed penalties to knock out Liverpool. In football, just because a team wins a strong team doesn't necessarily mean they will win a relatively weaker team easily. Aston Villa are going to put up a fight. this is a team that can be clinical and can defend very well. We saw how they played against Bayern and hocked everybody.
Let's not forget the kind of coach Emery is. He is a very experienced and tactical coach. If any manager can knock out PSG with Aston Villa it is him. He knows how to set up his team to play against a team like PSG. The advantage PSG has aside from the fact that they're the better team and also have a very tactical coach is the fact that it's a 2 legged tie. If it was just a single leg it would have been more unpredictable.