Even though it's still early days, it doesn't matter because the odds can change as the tournament progresses.
Is PSG still your favorite? For us, it's Liverpool at the moment.

Even though they're not the favorites, they still have a chance, odds of 6 are good enough to take a risk, But i will choose Liverpool since AC Milan not going to any europe competitions. Well, we also need to remember if not many clubs have been able to defend their Champions League title for two consecutive seasons. So, if PSG also experiences this, there's a chance they could fail before reaching the final.
Only Real Madrid has been able to defend its Champions League title, which makes me doubt PSG's chances of winning the title again this season. This is a valid reason, especially since PSG's success has created a sense of complacency, which will dampen their ambitions this season.
Liverpool may be strong favorites, but I think the competition in the Champions League remains fierce, with plenty of surprises to come, so the percentages between the two teams won't be that great.