It is more possible and easy for Ronaldo to go to Chelsea than for him to go to PSG, this is because they already had three big names that they are paying large amount of money in the person's of Messi Neymar and mbappe, adding Ronaldo to these three will cause very much and the FIFA financial rule might not encourage so. Ronaldo has big chances of going to Chelsea since rumor has It that it was one of the reasons that Thomas was sacked because he refused to get Ronaldo to the club against the wish of Todd
You're right Ronaldo going to PSG might be difficult because PSG has 3 stars on the front lines. So if Ronaldo goes to Chelsea it will most likely happen because Chelsea front line needs players who have the instinct to score more goals and Ronaldo can be the best choice to fill that gap. Moreover, Todd really likes Ronaldo style of play, of course he will try hard to be able to bring Ronaldo in the January transfer market. For now, we will see Cristiano Ronaldo on the world cup stage. If Ronaldo performs well at the World Cup, maybe not only Chelsea will be interested in getting Cristiano Ronaldo, even other teams will join in the hunt for Ronaldo signature in January.