Apples and oranges. While Eau de Guerlain might indeed be a high quality eau de Cologne-type fragrance, Eau d'Hermes is nothing of the sort. It is instead a profoundly animalic leather scent with a conspicuous cumin note that many find highly objectionable. (I happen to love it.) For a more traditional eau de Cologne against which to compare the Guerlain you might try Acqua di Parma Colonia, Monsieur Balmain, Iskander, or Eau d'Orange Verte.