When comparing Menote vs Greenify, the Slant community recommends Menote for most people. In the question“What are the best Material Design apps?” Menote is ranked 44th while Greenify is ranked 49th.
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Pros
Pro Allows creating password protected notes
Pro Can generate a link for sharing or publishing
Pro Even works without ROOT
Greenify even offers battery savings to non ROOT devices, though it may be limited compared to what can be done with ROOT and Xposed.
Pro Hibernates, instead of freezing apps
Greenify's mane function is to hibernate any installed apps. This allows users to to quell overly active apps that are draining their battery without having to delete them. This can be done with or without ROOT.
Cons
Con Free version comes with just 50MB of space for notes
It's easy to run out of space for notes. Especially if there are images or videos attached. The paid version gives an extra 1GB of storage, but even that seems a tad too little.
Con Greenifying without ROOT has to be done manually each time
When using Greenify without ROOT access to hibernate apps, it has to be done manually each time. There is a widget and shortcut that users can set to their home screen to make this action a bit easier though.