The records between the two teams are very close to each other, the number of wins both teams have had suggest that the game can be won by any of them. Juventus will want Napoli to win so they can remain top of the table, and it is not unachievable. Inter Milan are the away team and will not see it easy to be the stronger team at Stadio Diego Armando Maradona where Napoli will be fighting to keep their competition space in the champions league, while Inter Milan will not want to loose their first place.
You are right, Juventus took over the standings after winning today's match and Inter Milan certainly won't let it go like that they only need a draw to take over against Napoli because Inter Milan is only one point away from Juventus but Inter scored more goals so that when both teams have the same points Inter will take first place. If compared based on statistics, Inter has no chance of losing they have a strong defense and reliable attackers.