The great thing about OneDrive is you get 1TB of storage per user - regardless if its a personal/home license or OneDrive for Business. You can access your files on the go with any device synched to your OneDrive and you can securely share your documents only to those people who have permissions to access or view your files.
It is important that you people are educated and governed in what content is saved to their OneDrive account vs Content that's tagged with metadata and more easily manageable and accessible for all your staff in a SharePoint Site. You want to avoid silos of information and OneDrive can present a minor risk in that regard.
We can help you educate your people on the correct use of OneDrive through our training and change management services. Visit this page to learn more.