The reduced competition is the real advantage. With fewer active listings for buyers to compare against, a winter house that shows well can stand out far more than the same house would sitting among dozens of spring competitors.
The buyers still active in winter tend to be under real pressure of their own, a job transfer, a lease ending or a closing deadline, and that pressure often moves a deal from showing to accepted offer faster than a casual spring browse would.
Winter selling asks more of staging and photography, since the yard cannot help you the way it can in May. Get your hand-reviewed valuation from Joel Dyck.