Roma are in high confidence ahead of the match vs Napoli, they have just managed to move up to the top four after beating Sampdoria last week. When it comes to consistency this season, Napoli is more consistent than Roma. Roma victory over Sampdoria was also lucky from the penalty spot, they didn't play like the Winning team against Sampdoria.
Despite playing at the Olimpico, it is very difficult to predict Roma will win this match because Napoli's performances this season have been very consistent and they are very difficult to beat. A draw may be obtained by Roma despite playing at the Olimpico because Napoli are one of the strong teams this season.
Even though Roma have better confidence, Napoli quality of their game play is better than Roma. I think if Roma manages to hold on to a draw it's good. I'm not sure to say AS Roma will win this match. However, I am more confident in a draw or a loss. Not to underestimate Roma, as has been stated in the previous comment, Roma has improved, but not enough to fight to beat Napoli. unless there are a lot of mistakes made by Napoli players, then for me it's a luck for Roma