After through Iain's OneNote insights thread recently, I again reviewed my usage of these programs. Didn't want to clutter his thread with my personal issues, so starting my own.
I have never been much helped by the comparisons on the net because they always seem to be written by people who use one and have a limited insight into the other; compounded by not being familiar with their functionality on all the platforms I use. I've never been expert on either program, which is why I'm happy to learn more, every now and again. But I have used both from soon after they launched (sometimes more and sometimes less) and I have always used both rather one only (have Office365 and Evernote Premium).
Evernote for clipping, speed and similarities across platforms; visually intuitive and works well without organisation. OneNote for stuff that requires more organisation, or more functionality, and where speed isn't an issue, though often irritated by quirks and omissions; but it does seem to be getting much more corporate love recently with some emphasis on other platforms.
I also have been frequently discomfited by the moving boundaries of the entry boxes - not at all controllable on Android - but impressed with the idea of using tables as containers which I think I will find very useful. I still don't find it clipping as well as Evernote, or working so fast, and still seems cumbersome for random and unsorted notes, but I can see myself using it much more. If only...
.. it's tagging was more functional. So ironic.

I can remember being one of those who protested when Evernote dumped hierarchical folders and shifted to tags. But now I really appreciate the value of tagging as a system and OneNote's isn't good enough. And hierarchical folders aren't the same thing. So, with that insight, I've been thinking of moving heavily to a system organised around a tagging hierarchy for everything; still keeping folder setup as it is now. No problem on Evernote and I can use the same system on OneNote, so far as it is able. And hopefully the same for files using Tagspaces - though I've not used it before and it may fail woefully in practice. Doing that on Dropbox and Google Drive should give me access on all platforms. I certainly won't be organising more than a small amount of stuff in this way, but I can see it helping a lot with many projects, and smooth my use of multiple platforms.