When comparing Greenify vs Flud, the Slant community recommends Greenify for most people. In the question“What are the best Material Design apps?” Greenify is ranked 49th while Flud is ranked 54th. The most important reason people chose Greenify is:
Greenify even offers battery savings to non ROOT devices, though it may be limited compared to what can be done with ROOT and Xposed.
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Pros
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.
Pro Encryption, IP filtering, and proxy support
Pro Top of the line UI
Flud uses Holo UI, so everything runs smoothly and looks great.
Pro Can be run in the background
Includes "keep running in background" option that can be accessed from the settings menu.
Cons
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.