By looking at the last few matches between the two teams, both Real Madrid and Chelsea, I am more confident that Chelsea will qualify for the next round.
I think Real Madrid beat PSG because PSG players made a lot of fatal mistakes, causing defeat, more precisely Real Madrid won because of luck, but on Chelsea's side it was because of the quality of their football game, which was very good.
it seems you are very confident about it but you have to be careful because some time ago also PSG were that confident but in the end they lost lol.
I don't really believe in luck when talking to football because it is something that is certain if you win, you win and you lose, there is no luck there. What makes them win is strength on the field and teamwork.