Mega is the second iteration of megaupload, funded by piracy and shut down by the FBI some years ago. The founder is shady and has under many ongoing trials and extraditions claims.
https://en.wikipedia.org/wiki/Kim_DotcomSeriously. Don't hold your personal files on mega. They can be shut down any minute and delete all your data. That's what happened last time.
Dropbox is a respectable business. It's not comparable.
