I use Evernote extensively across several Macs and iOS devices using native applications, a Pebble watch using Powernoter (awesome for checking off shopping list items while in the store), and my Linux desktop at work using the web interface. I like that I can tag and apply other metadata for organizational purposes, encrypt entire notes or just portions of text, and it's all rich content so I have one entire notebook full of Owner's Manuals in PDF format. They also integrate well into the various platform operating systems, for things like clipping and sharing.
Apple has enhanced their iCloud Notes ecosystem to have rich content, but it does not have the metadata or organizational tools that Evernote has, as well as all the problems with iCloud such as it syncing when it wants not when you want and with no feedback about errors, dumping data if it thinks you're low on space (leaving you screwed when you're on the plane), terrible conflict resolution, and it does start to cost money if you exceed 5GB of iCloud storage (which counts iOS backups and Photo Library if you use those, as well as all other iCloud documents saved there).
All this makes me long for the simple days when I used TiddlyWiki on a flash drive I'd carry around and plug into computer or laptop, back before smartphones and other mobile devices.
I'm not jumping ship, but I'm curious to see how this plays out.