I got tired of keeping track of changes at Google, plus their programs are very heavy in power consumption. Dropbox is quick, has always worked for me, and you don't even notice it in the background.

I try not to touch Microsoft stuff because of their constant changes too, and I was annoyed at their advertisements in Windows 10. I'd rather just not deal with any of their stuff.

I would probably stop using Dropbox if Apple started offering the ability to share folders with other iCloud users.