We have recently set up both and Google apps is easier to manage and migrate to. From a user standpoint teachers and pupils find the google platform with the classroom app very user friendly and great for education purposes. MS are behind from an educational standpoint. Google apps also seems to work better across all types of devices. The only feature google apps lacks , that MS sharepoint can provide, is a central place for shared teacher /student resources (Google apps requires every document is owned by a user). Google apps also has a useful mobile device management tool if you use tablets, chromebooks etc.