Yes the PSG vs. Madrid game is one of the biggest games that could have happened in the whole final round regardless of the stage. Now it is so early that one team with ambitions to win the title has to say goodbye. That's kind of crazy. Madrid would be pissed as much as PSG would be. PSG maybe even more because there is nothing else they can do if they now fail. Messi, Neymar, Mbappe, and many other stars were signed. If they now get kicked out in the first round of the final round, they are into a whole lot of trouble.
It's going to be a game with a whole lot of pressure, for the two managers and all the players, two teams that are amongst the favorites for the CL title and now one has to go in just the round of 16, it's going to be a match of fine margins and the winner of this game will be making a big statement and sending a warning message to other title contenders. Having said that, I think you're correct, between the two teams PSG are the team under the most pressure, there's just so much expectations placed on the team cause of the quality they boast of in their team, though I've watched all of their CL games this season, and they do not look ruthless enough to be champions this season, but mind you that all that can change in the knock out stages. I'm rooting for Madrid to win this one, but we'll have to wait and see the team that does.
Whoever loses in this match will have reason to be very angry at UEFA because due to a big mistake in the Champions League draw, these two clubs have to play each other in the early stages of the competition.
In fact, it is a big loss for the competition that one of these two clubs will drop out of the CL in the first round of the knockout phase.
Personally, Real seems to me to be a more complete team, with a slightly higher chance of passing, and the pressure on the PSG players will certainly be very great. A lot of money has been invested in the PSG team and they have not yet managed to win the Champions League.
I believe their owners have already become nervous and impatient, they are even willing to sacrifice the big money they could get for Mbappe, just to finally win this competition. Will that risk pay off?