a very balanced match, both teams have a fairly balanced history, in my opinion there won't be many goals scored, the 1-0 score that Barcelona will win in the 2nd leg might be the deciding factor, or Napoli could give a surprise by eliminating Barcelona. , If this happens, it will be a bitter farewell for Xavi,
Xavi and his boys has always had to concede goals in their domestic league games recently and has not been in the best of their performance and this has made me doubt if they will be able to comfortably get a win over Napoli especially with the fact that they will be hosted by Napoli, they have not been really good with away games in recent times so I see it as it could be challenging for them because even in the weakness of Napoli they still will not want to just loose especially as this is champions league and not any other of their regular domestic league.
I agree with you that these two teams are out of sync this season. However, I consider Barcelona as favorites in this match.
Barcelona's overall performance is better than Napoli's. Napoli's attack and defense are both weak. On the other hand, although Barcelona's performance is erratic, this team cannot be called weak. Their main weakness is their defense. If Xavi can tighten up Barcelona's defense in this match, victory against Napoli is possible. However, if Barcelona's defenders perform badly in this match as in the previous matches, then Barcelona may not be able to win. But my guess is that Barcelona will either win the match or the match will be a draw. Napoli doesn't look like my favorite to win.