Rennes was able to beat PSG in the previous season, but this season Rennes is completely different. They experienced a decline in performance, while the Nice club experienced an increase. But if Rennes succeeds in winning the match against Nice, I personally will be happy because then the Rennes team might be able to recover. Even, if my bet lose it doesn't matter for me. Also, there is a chance for PSG will quickly to the top in standings because on Matchday 11 they might be able to get full points against Montpellier.
However PSG have a tough competition this season which is Nice they've turned out to be one of the best in the league and are currently the at the top based on the good performance, what suprises me is that they're not very strong on their attacking line but they got a solid defense and midfielder that's really helped them get this far and I believe they'll win Rennes is their next match.