I don't normally recommend MS stuff but I really like OneNote.
OS X Notes are good enough for me and better than Evernote. Evernote insecurity and quirks were just one straw too many.
On that note -- emacs-org mode is a great FOSS note and organization tool.
OneNote is nice. I'm always bugged though by the fact I can't double click a word and drag the cursor to highlight more words. Such a small thing, but it annoys me endlessly.
The Chrome plugin is a little dodgy (Clip to OneNote) at times, but it's hard to blame it, with Google pushing updates every other day.
OneNote on Mac is pretty slow, I find the editing features somewhat lacking.
what do you use instead?
Still OneNote, it's the one that sucks least. I'm contemplating moving to iCloud Notes though, the new formatting features are neat.