I use Dropbox for store my document on cloud or online to use it any where.
The synchronizing of my documents on Dropbox software is very fast.
We can also use some other things like personal videos photos apps and etc.
But space provided by Dropbox is to small only give 2gb free cloud storage.
Dropbox application is available for windows os android and also ios.
Use of this software compare to it conventional website so easy only install and drop your documents on it.
And also it provide 30 days trash recovery.
So by service wise is best but storage is very low.