Long time user of Evernote here, so I start this with that in mind.
I moved from Evernote to Notes.app awhile back, and then have flipped back and forth between Notes and Agenda several times. I WANT to use Agenda, because I love the reminders integration and the calendars integration, this is super killer. But, I don’t WANT to user Reminders, I want to use Omnifocus. Hence my request in other places to please figure out a magical way to support Omnifocus for tasks.
The other reason I keep flopping back and forth is because Notes supports attachments better. Not as good as Evernote, but better than Agenda. Yes, I can attach a word doc, or a PDF to a note in Agenda, but it renders it as an icon. I want a preview of the doc (or ppt) and be able to flip through it (like Evernote), or a PDF, and be able to page through it. Also indexing of all of those things. Notes does this, again, not as good as Evernote, but better than Agenda.
To be clear, I LOVE agenda, and I want to move to it, but it does just enough things this much not enough for me. Maybe it’s just me.