Borussia Dortmund might be a little more comfortable because they only need a draw and even if Borussia Dortmund loses they still have a chance to qualify, but not for AC Milan in this match AC Milan will give everything because if they can't win then it's almost over. make sure they won't make it out of the group phase.
Yes, it's true that Dortmund at least only needs a draw to qualify for the next round, but at least Dortmund can win to be more calm and safe, even though it will definitely be difficult to win the match at AC Milan's home ground, so far Milan's defense is very good, that's why maybe Dortmund it will be difficult to steal a full victory from the match later.
On the other hand Milan may need a win to have a chance of progressing to the next round, previous meetings these two clubs only settled for a goalless draw, that's why it will be a betting game that determines who from this hellish group will progress to the next round, I'm sure one of them will win in this match, even though Milan is very superior in the betting market, I am more interested in Dotrmund who might succeed in stealing full points in the match later with a narrow score.