A couple of things I noticed when moving to OneNote:
- OneNote doesn't have tags
- search function is pretty primitive compared to Evernote
- The Webclipper is frustrating: Websites are often clipped as an image. Very frustrating if you actually need to work with the content afterwards.
- ON seems to generate much more traffic on my phone.
- publishing notes with Evernote is much better: You get a public link, etc. Everything looks more polished. Also, when publishing clipped websites you automatically get the link to the source. In ON it just looks bad. (I use Evernote for press articles.)
- Spellchecking is a mess in ON. For some bizarre reason they've decided to set the notes language to your keyboard locale. It is ugly as hell. But there's a macro for OneTastic to reset the locale.
- no Context.
Good things in ON:
- free form canvas
- no more messing your notes up when you work on them cross platform.
- Excel-tables natively supported
- as somebody noted, Evernote is practically a vault where you never touch stuff again. you basically hide everything behind tags. Then you use the search to get only relevant stuff. That's partly due to the UI. In OneNote you organise your notes more "optically" and actually reread stuff.
I introduced ON at work and we now couldn't do without it. I've been using Evernote in privat for several years. Now I'm using both - EN for press and my literature library, ON for everything else.