Although Google's G Suite is more than enough for the office-related needs of many companies, Microsoft is working on a tool that would ease their migration to Office 365. If everything goes as planned, this "G Suite migration experience" should become available in the second quarter of 2019.
https://www.notebookcheck.net/Would-you-migrate-from-G-Suite-to-Office-365-Microsoft-thinks-so-and-is-developing-a-tool-for-it.361306.0.html