In my own experience, Google Drive is a better solution as far as I can say.
- Fully rich REST API.
- A dozen of client libraries for each language.
- Open with your application support from Google Drive UI: https://developers.google.com/drive/integrate-open
- Dozens of samples for each client library and language.
- Great community support and responsive Googlers.
- Google brand is internationally more welcomed, therefore Google sign is more trusted.