It could be that Napoli will not win the Serie A title this season, they have lost the sharpness they had when playing against the relegation zone teams they drew and it is a shame that Venezia's defense is not so good and that makes me wonder if Conte taught their attackers to shoot well? even though they have more time than Inter who are still very busy with their schedule, I think Napoli really missed the opportunity to fix it this season, but it is not easy and it is natural in my opinion they failed this season because it is impossible for Conte to win it that fast they need time especially some of their players are absent due to injury.
Inter's victory over Atalanta convincingly showed that Inter has a better chance to retain the Serie A title because their performance has not decreased and is stable, that is what makes Inter deserve to win Serie A in my opinion.
Broadly speaking, I agreed with you, and Inter Milan does seem more prepared to win the Scudetto this season. Napoli started losing their sharpness since they released Kvaratskhelia to PSG, I think that's the main reason and it has hurt them in the competition. Napoli has only managed to win one out of their last five matches, clearly that's a big problem for a team competing for the Scudetto. Atalanta might just be a dark horse this season, but they could rise to put serious pressure in the remaining matches ahead. If Napoli fail, Conte cannot be blamed completely, he cannot do much with the depth of the available squad.