Problem with cloud encryption is, when you need share files. For example I use OneDrive for send photographs/videos for my clients. But with encryption, I cannot send them anything.
If you're willing to use SaaS services (as you're mentioned OneDrive already), there are proper E2EE providers where you can work together and share files. Although I am not sure real time collaboration (such as Google Docs or Office online) is feasible with end-to-end encryption yet.
OneDrive is cheapest 1TB cloud storage I can get. I don't care about realtime colaboration, ony sharing files here and there, but having them encrypted on cloud.
Well... 99% clients wont install thirdparty software to decrypt shared files.