Liverpool have shown in this group stage that they are capable of beating any team, and they will play their first game away, which I think could give them an advantage. This is possible if they do not lose the first match. I see that Liverpool are expected to easily cope with PSG, but I think it will be a very difficult game. The confrontation between Real and Atletico is also difficult and I do not see an easy victory for Real, I admit that Atletico can surprise.
The Liverpool vs PSG match will indeed be quite fierce. But in the first leg a draw could happen which would bring more benefits to Liverpool because in the second leg Liverpool will be the hosts. But if Liverpool can win from the first leg then in the second leg Liverpool will probably play more comfortably and make victory truly more certain for them. PSG this season in the UCL is not very strong. So I personally will also favor Liverpool in this match.
For the Real Madrid vs Atletico Madrid match, I think it will be difficult to predict. Because Atletico Madrid this season has really changed into a stronger team. In fact, for the moment Atletico Madrid is also at the top of the Laliga standings. Meanwhile, Real Madrid just got defeated in Laliga. But domestic league results sometimes cannot be used as a reference. Moreover, we know that Real Madrid in the UCL can always play better at the right moments.