Neither are "unlucky". Everyone has problem areas within themselves that they must work with. It is not really the placement by sign that indicates difficult areas, but the aspects between the planets themselves.
Yes, Moon is in Fall in Scorpio, but this is a minor influence, of little consequence. It only means that the emotional nature doesn't express itself quite as easily as, say Moon in Taurus. But moon in ANY sign works well in some ways, not-so-well in other ways. Astrology doesn't work well if you think in terms of black-or-white, all-or-nothing, lucky-unlucky. Neither life nor astrology provides THAT degree of surety.