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Out of interest, why (unless you were German or German-speaking) would you buy a German catalogue for France and Monaco?
As a matter of fact, I am German-speaking. That aside: 1) I'm not aware of a native-Monaco catalog, and 2) language isn't a relevant measure of accuracy or completeness (I wouldn't use SG for USA, or Scott for British Commonwealth, for example).
I happen to use Maury for France, but that doesn't mean that they or Yvert cover Monaco better than Michel; I don't know one way or the other, but my experience using Michel has always been positive.