We recommend using OneDrive to most clients as it is available on every platform for free and includes a generous amount of space. Previously clients employees who connected OneDrive to their personal account (For files, pictures etc.) were unable to attach to OneDrive for Business included in their companies Office365 subscriptions. A recent update allows you to connect your Android client to both personal and business accounts simultaneously with a clear distinction between personal and business folders ensuring you are aware of which files you are accessing.
The Android app for OneDrive also now includes support for a security PIN. As many users still do not PIN their smartphones this is a must if users are connecting to OneDrive for Business.