Ever advancing Google Co. has unaccountable applications one of which is Google Docs and Sheets .They are beneficial as they offer an ease in corporate communication and a simplified collaboration of many types of files. The add on Drive apps are a way to share variety of information being very easy to access as they need a google account which can be accessed from anywhere on a device.
Setting google drive is preferable because it stores and synchronises all the information at one place which makes work easier.
Using sheets and docs offline is preferred for people who either work on them or use them for education purposes.