Over the past year I have used all three services. OneDrive through both normal OneDrive and OneDrive for Business, Google Drive, and Amazon Cloud storage. They have all had their ups and downs, with syncing issues and sharing issues, but Amazon topped the list as having the most issues. Uploading anything failed more often than not, and uploaded files were often corrupted. It doesn't have a sync client that is in any way similar to OneDrive or Google Drive, although third parties attempt to fix that issue. The price for 1 TB of storage on Amazon is not worth the frustration. They have put absolutely no thought into the service, other than to put it out there.
Comparing two services that actually work, OneDrive and Google Drive are fairly similar in terms of quality. They can both store more photos than I have taken in my entire life, and they both provide workable office suites.
For my daily life I primarily use OneDrive. It does a better job at being both an online service and a local service. I found Google Drive works best if you only use a web browser, which I don't.
As for the free tier issues and Groove, I don't see those as any indication on the future of consumer OneDrive. I used and loved Groove, but it sadly never go the attention from anyone that it deserved. OneDrive has never been that way. It is directly attached to one of Microsoft's most successful products in both consumer and business, and that product also doesn't seem to be going away anytime soon. Groove stood all on its own, and met a sad end.