Groups D, E and H seemed to me the ones with different possibilities. I mean the other groups have already two favourite teams to qualify but in these groups, you have one and a hard competition will occur between the rest.
In group D, I think we all agree that Inter is the favorite one to qualify most likely in the first place. For number 2, we have Benfica and Real Sociedad, both are quite good and could pass to the next stage. I don't think Salzburg will be a candidate but it will be an obstacle for one of them. I find Real Sociedad a little bit better than Benfica but I am not fully confident about that.