I do still keep my Dropbox because it has better sharing features. But I only use that with my wife and we haven’t used it to collaborate since she finished her Masters degree. If anyone has the edge with features, it probably is them. Some of the lesser known names I have accounts worth as well, but they’ve had sketchier history with storage issues. OneDrive simply gave me the most space for free, and I usually pimp myself out to the highest bidder.