To see the quality of both of them, maybe Liverpool is a little better because they have experienced much tighter competition in the Premier League so they are used to facing big pressure in the Premier League, they will be much more used to facing pressure in the Champions League. In contrast to PSG who only face much easier competition in Ligue 1 so they are not so used to facing big pressure although that is not the only reason that we can use as a reference.
The result of the first leg will be quite decisive because whoever wins the match will have a much better chance of advancing to the next round and perhaps this opportunity will be utilized by PSG when they face Liverpool later.
Agree with you. The Liverpool vs PSG match can be said to be a very ideal match because both are the rulers of their respective domestic leagues, even their positions in the domestic league are both in a safe position because the points difference from their competitors is too wide. However, even though they are both rulers of the domestic league, their games are certainly different, as you said that the EPL league is more competitive than the French league, so Liverpool is mentally better than PSG.
However, even so, the Champions League always happens things beyond expectations, because every team in every season must have a dream in the UCL league, especially PSG, for several seasons they have always focused on the Champions League. So even though Liverpool is very superior in this match, PSG still has a chance because in football there are always moments that make them win. Will there be a dependence on individual brilliant moments that make them win? Or is it the coach's tactics that make the difference in this match that makes them win? and there are many more things that make the results of this match different, so this match is worth waiting for.