Personally, I look at it like AMC vs DMC and ST vs defenders. If the opponent has a weakness in the defence i would avoid the AMC and have more strikers. But I think either formation could still work.
I'm not a fan of using players when they are not needed, example being when I'm up against a 4-1-2-1-2 narrow diamond, I tend not to use DL/DR since I'm playing against a narrow formation. 3 DCs is enough and you can use the extra player in midfield or as a striker.