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There is indeed quite a gap between the performance of the two teams that will compete this week and I think apart from being favored as hosts, Juventus also has the opportunity to win this match. Napoli still don't look very convincing after their heavy defeat to Inter and that will make it difficult for them to recover against a similar team.
Juventus has a high probability of winning the home game against Napoli. I think it makes sense as Napoli were not in their best form heading into the match. Napoli are no longer as strong as last season in all competitions, in fact I believe they will have difficulty qualifying for the Champions League next season due to the team's declining performance.
So far Napoli have lost 8 points in their last 5 matches where they got 1 draw and 2 defeats. Napoli lost to Empoli 0-1, was held to a draw by Milan 2-2 and was defeated by Inter 0-3, all of which happened at home. If Napoli fail to take advantage of home games to win, then they really have lost a lot of things to fight for this season. The match against Juventus is very difficult, so I think Juventus will win the match and compete closely with Inter at the top of the standings.