I think Atalanta is far better in all aspects compared to the Milan atm. I do like how man on man's marking strategy by Gasperini. It's always doing very well in the big match, and i expect him to do that again soon. They get 2.06 for a home game, that's very tempting odds, but the gap to ward Milan is not that big.
Indeed, if you look at the conditions of each club currently, Atalanta is in a very good position, even with its position at number 2 standing makes the club more confident with their performance this time. It's just that, later AC Milan will be their opponent, so Atalanta can't be more relaxed if they want to beat this club. Milan is not that good, however, how they are when they fight a top club, it will usually be quite different, they will be more motivated and enthusiastic about their best form. Yes, this is where Milan often is, not consistent enough to go through each of its activities, that's why many people doubt it.