When comparing Greenify vs QuickPic, the Slant community recommends Greenify for most people. In the question“What are the best Material Design apps?” Greenify is ranked 49th while QuickPic is ranked 55th. 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.
Ranked in these QuestionsQuestion Ranking
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 Fast performance loading photos
QuickPic displays photos ultra fast and performs better than most stock gallery apps. Developed with speed in mind, QuickPic will make working with any library of photos lightning quick.
Pro Supports multiple online photo album services
QuickPic integrates with: Flickr, Picasa, 500px, and many more.
Pro Supports hidden images
In order to hide an image, start the title with a period. This can be great for privacy purposes.
Pro Excellent file management tools
QuickPic offers excellent file management tools, with the ability to move and rename photos, users are in total control over the photo library. Easily find new photos by date or location with the grouping tool.

Pro Impressive video-player
Allows to lock a video in landscape mode and intuitive controls via swipe gestures.
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.
Con Buggy and unstable since acquisition by Cheetah Mobile
v5.0.0, after acquisition by Cheetah Mobile, has countless bugs and basically nonoperational. This, probably, clone of original app, assembled from alternative, home-made and very low quality source code.
Con Untrustworthy
It's owned by Cheetah Mobile. That says it all.
Con Removed from Play Store in 2018 and rightfully so
