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.
Of course Atalanta clearly is a better team than AC Milan this season and the statistics authoritatively backs that claim. The 2:06 odd for AC Milan to win at home should tell you that bookmakers are doubting their abilities which is why they're backing the home team to win the game. No matter how tempting the odds for AC Milan to win are, I'll never stake my hard earned money on the AC Milan to win at Atalanta.