I have the same feeling, OneDrive is garbage compared to Dropbox, insanely slow and terrible UIX and yet it is widely used. Classic platform move, bundle X with Office and it will be used by millions.
Edit: I use Google Drive because of Google docs. sigh
Also, a fair amount of big companies block access to every other storage platform via MITM after they buy OneDrive. Which forces vendors to buy OneDrive to interact with their bigger clients.
I doubt very much. The OneDrive has had a better website than Dropbox since it was called SkyDrive. Dropbox used to have a better desktop client but I would say they are on par now.
The enterprise OneDrive is SharePoint, not SkyDrive/Live. The interfaces coalesced, however, in the past they were two different things, each with their own quirks.
Edit: I use Google Drive because of Google docs. sigh