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I use Box but Box has some flaws compared to Dropbox. Sync is broken and they don't care. On Dropbox you could have the windows client installed and open a Truecrypt file, make some changes (add/rename/delete/change files within the container) and when you close the Truecrypt file it syncs the changes properly. Do the same on Box and it looks like it's working but it's silently losing your changes; no errors, warnings - nothing. I reported this and they don't care. So you can only trust them with whole files. That's fine, once you know, for a free product, I guess. The version control can be seen as a deletion with no undo too; if you accidentally increment the version number of a file (by uploading a new file of the same name, I think this is what I did) then the earlier version is there but you can't get at it with the free service. Not even by deleting the newer one and reverting. So be very careful what you do. Still, it's better than nothing as a free secondary backup.

I think Dropbox has many more users.

Not really. The latest crop of unicorns have done a really poor job of managing capital and they're getting slaughtered at the public markets(see twitter and snap). Dropbox has probably set themselves up for a similar fate