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For a word where both -es and -s are allowed genitive forms, -es is indeed considered more poetic, but could also be interpreted as outdated as stated by Maico Heere. The Duden says that -es is preferred in constellations where the genetive is prefixed (e.g. des Tages Hitze) or within compounds with interfix-s (des Geschäftsfreundes).
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