Marseille will face a very tough challenge to maintain their consistency and also their position in the current standings, the home team factor does not seem to have much effect on them considering the opponent they are facing is PSG, so far we know that PSG is not a team that have a big influence when they have to play away so PSG still be dangers teams for marseille in the match, I don't think if PSG has currently experienced a decline in performance in the league because in fact so far they are still a team that has not defeated with a high goal productivity among other teams today, but if we talk about the competition in Ligue 1 today, of course I agree with you very much because with the improvement that has occurred for Marseille and Monaco at the moment, it will indirectly give us an interesting spectacle because the league is more competitive than the previous season.
If you look at h2h PSG is superior to Marseille, especially as you said PSG this season is the most productive team in scoring goals and PSG is also not affected when playing at home or away. Even PSG has not been defeated in eleven matches when visiting the Orange Velodrome, so this will be a tough test for Marseille to be able to get three points in this match.
Currently PSG is in an undefeated condition in Ligue 1 with Monaco, they have won six times, and drawn twice. Of course PSG after failing in the Champions League, they also do not want to fail in League 1 at least they have to maintain their first position in the standings.
Although Marseille started the season well and even they performed brilliantly under coach Zerbi. However, they seem to be very difficult to beat PSG, maybe they are only targeting this match to end in a draw because PSG has the strength needed to win.