I have a slightly different opinion than you. I think the Barca and Napoli pair is quite unpredictable; they are the reigning champions of both the Spanish and Italian leagues. Currently, the form of both Barca and Napoli is not good, but when they face each other, the result is hard to predict. Napoli's style of play remains challenging for teams from England and Spain. Therefore, it's not easy for Barca to overcome Napoli in this round.
I believe there might be a surprise in the PSG and Real Sociedad matchup. Most people rate Real Sociedad lower than PSG, but their form this season has been quite good. I think they are even better than PSG at the moment, not just because they dominate their group with unbeaten performances.
These two teams are equally strong when viewed from their status as champions in their respective league, but this season both team have experienced quite significant setbacks for them in the domestic league. I think the meeting between these two big teams will be quite interesting because both of these team both have stickers that were quite productive in scoring goals in the previous season and even became top scorers in their respective leagues. So we will see the quality of Osimhen and Lewandowksi in this match where these two players are an important part of their respective squad so that their best will be seen when they succeed in scoring goals and bringing their team to victory.
This match is difficult to predict, but in my opinion, if napoli does not lose any players or not things are injured, Napoli will be able to provide significant resistance to Barcelona. Barcelona too will have the first leg with an away match which could be difficult for them later. Xavi doesn't have a special record in helping barcelona beat teams from Serie A representatives. So this will be a tough job for xavi in the round of 16.