My most frequently used thrifting platforms are Poshmark and Depop. I find Poshmark to be the best for selling clothes, as it is easy to promote items, manage deals/offers, and communicate with customers. Depop, however, is best for shopping. The sellers there clearly cater to a younger, more trend and fashion-minded audience. It's much easier to browse and find good items--on Poshmark, you generally have to know what you're looking for. Depop is fairly easy to use. The processes can sometimes be a little overcomplicated (ie. messaging before buying, figuring out how to negotiate deals/bundles), but this is largely due to the culture of the users and not the app's interface. Overall, I've found Depop and Poshmark to be the best, as they are easy to use across all devices and simulate the in-person experience of browsing the best.