BTW Tradesy comparison table is a total BS and someone may report them for false advertising. Cosigners do NOT always take 50% (it's 35-40% online, 50% locally), there's no withdrawal fees and charges for cleaning images, etc. I tried to consider all other selling options, correct me if I made any mistakes.
Sell yourself
eBay (fees 10+2.9%, huge traffic, excellent search, excellent google ads, virtually no scam protection, your own pics and description)
Poshmark (fees 20%, moderate traffic, good search, no google ads, not much protection, your own pics and description), works only from app
Vestiaire Collective (fees 30%, there are promos for fees now and then, huge traffic, great search, bad google exposure, your own pics and description, they clean main picture, moderate protection - you ship items to VC for inspection first).
Etsy (fees $0.20 to list+3.5% for selling+3%+$0.25 for processing payment, great traffic, search, google ads, quite good protection, your own pics and description). Only for vintage items over 20 yrs, you are not allowed to sell current collections.
FB private groups (PayPal fees 2.9%, traffic depends on a group, do not appear in Google search, your own pics and description,only PayPal protection)
Craiglist (virtually free, traffic depends on your area, your own pics and description). mostly local delivery.
Consign
RealReal (fees 40%, great search and traffic, ok-ish google ads, they take care of everything after you ship it, biweekly payment)
Ann's Fabulous finds (fees 10% for above $3000, 25% for $500-3000, 40% for up to $500, ok traffic, they take care of everything after you ship it).
Fashionphile (fees depend, they give you a quote, great traffic, great Google ads, they take care of everything after you ship it)
Material World (consign and trade in, fees depend, they give you a quote, great traffic for their eBay store, they take care of everything after you ship it).