Microsoft has a Gmail migration tool. not sure if MS is cheaper, but it is stupid easy and fast to migrate from Gmail/gsuite to o365. just plug in credentials and hit run.
I've moved small businesses on gsuite free, multiple personal gmails over using their tool, and I have not had an issue in the dozen or so corps I moved
I've moved small businesses on gsuite free, multiple personal gmails over using their tool, and I have not had an issue in the dozen or so corps I moved