I'm sorry, I really can't take a service seriously that can't even show me my file extensions in the web client. That combined with the horrible idea to release a Sharepoint client branded as "OneDrive for Business", the buggy clients integration in Windows 10, and the number of times they've changed messaging around "unlimited" storage... I don't see any reason to trust OneDrive with my data.
Oh and there's the nonsense "magic" it does with OneNote notebooks. In fact, I'm pretty sure I accidentally deleted a OneNote notebook earlier today when scrolling through my OD account with the Mac client.
The web client is the only reason I still use the damn thing -- it's really quite great. Full text search includes text contained within image files, FAXes, and wonky old PDFs.
My one issue with OneDrive when I tried it (late last year) was that it was very CPU-heavy compared to Dropbox. It noticeably slowed boot times, and syncing large changes slowed the whole system down for the duration. There might have been other factors at play here, but I've since disabled it on my Windows install and only use Dropbox, and I don't ever notice it's there.
I switched from OneDrive to Dropbox this year - was loyal to OneDrive since it was WL Mesh. Dropbox made a world of difference. No more duplicates, and so much easier to reorganize files.
One drive doesn't offer near the convenience or integration. I've used various incantations over the year from the initial skydrive through to its relaunch and then the latest version but each time I have been let down by unusual syncing behaviour or some level of strange complexity (the worst requiring re-syncing everything)
I've never had that issue to be frank. I use it on my laptop, my desktop, and my phone, and sync has been instantaneous and problem-free. I did face some issues with files blocking the sync operation, but that was fixed a while back.
One of the best features you get with OneDrive is full Office integration. You can either access your documents using Office Online, which are full-blown browser versions of Office apps, or you can open your files in Office on your computer. Changes you make to the document are live synced and versioned, so it's great for collaboration.
With Office 365, it's a steal.