Based on the calculation of points earned in the domestic league, Barcelona is better than Napoli, but overall, both teams are not at their best. Inter Milan are in top form, they are very obsessed with returning to the final and winning the UCL trophy after failing in the final last season. You also shouldn't underestimate Atletico Madrid, this team just held Real Madrid to a draw in La Liga, Simeone team also embarrassed Real Madrid in the Copa Del Rey with a landslide score of 4-2. Inter are better prepared to advance to the next round judging by their performance, but Atletico will try to knock Inter out quicker with their aggressive displays this season.
I would not call that victory landslide since it took additional time to determine the winner. In the pair Inter - Atlético Inter is the favorite, as can be seen from the quotes:
1.87 - 3.53 - 3.92
however, there is a nuance: Inter qualified from second place in the group, so the first game takes place in Milan. Inter must resolve all issues in the first game and as you can see, the probability of this is not at all high from the bookmakers’ point of view - only 1.87. If you take a win with a handicap, then the odds drop to a weak 2.80. It is obvious that if Inter does not win the first game, then Atletico will be the favorite in the return game. If Inter wins 1-0 or with any other minimum score, then the situation will be equalized.