I suppose it depends on who's being catered for by the platform. In Poland, we have an interesting situation in which most brands that operate their own stores end up selling their products on Allegro (local Amazon/eBay equivalent) anyway. I usually defaulted to brand's own stores, but my wife turned me around - you get the same products, from the same vendors, for the same price, but in case of any problems, dispute process is streamlined and extremely favorable to buyers.