How I Use Both Evernote and OneNote
I continue to use both OneNote and Evernote, largely because neither offering completely meets my needs. I find OneNote's more flexible information architecture useful when brainstorming and collecting information items for a project, for example, and I find OneNote's versioning and collaboration capabilities (in conjunction with SkyDrive or SharePoint) far more useful than Evernote's corresponding capabilities. OneNote's ability to highlight new activity in notebooks (down to the sub-page level), along with displaying author attribution, is also very useful.
Since I routinely use devices running Windows (my laptop), iOS (my iPad), and Android (my smartphone), Evernote makes my information more readily useful, with more feature-rich clients, than OneNote can currently manage. Mac users face a similar dilemma, since there's no native OneNote client for Mac OS — although I know many people who use OneNote 2010 on a Mac via Windows 7 virtualization.
I also find the ability to send email messages to my Evernote account very handy. While it's possible to send email messages into OneNote from Microsoft Outlook, I'm obviously not using Outlook on my iPad or my Android smartphone, nor am I working with Outlook when I send messages from services such as Google Reader.
As a result, I expect that I'll continue to use Evernote mostly for personal information management, and I'll use OneNote primarily for project-level work in progress and for collaboratively working in notebooks with other people. Fortunately, since both Evernote and OneNote support hyperlinks (although OneNote doesn't support links on the iPad, as previously noted), it's easy to create integrated views containing content from both solutions.