MediaFire has a history of taking down "inactive" files (files not downloaded in a certain period) and scanning user data. Qiwi prioritizes user privacy. Most Qiwi implementations offer options and do not actively scan your files for "inactivity deletion." Your files stay online until you decide to remove them, not when MediaFire decides they are old.
Free users get a simple download counter. Premium users get real-time bandwidth graphs, geographic heatmaps of downloaders, and referrer tracking. This is a game-changer for marketers and podcasters distributing large files. Qiwi - The Best Mediafire Alternative for File Sharing