When comparing Atlas vs Greenify, the Slant community recommends Greenify for most people. In the question“What are the best Material Design apps?” Greenify is ranked 49th while Atlas is ranked 71st. 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 Built-in ad blocking
The browser uses EasyList data to remove ads from sites. It can further be supplemented with EasyPrivacy data to limit website ability to track you.
Pro Stores preferences on per-site basis
The browser can be set to remember which sites need to be shown in desktop mode, with certain content filtering settings, etc.
Pro Can browse two tabs at once
Atlas has a dual pane view that shows two pages side by side.
Pro Can be set to very low data usage
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 Abandoned
Atlas was last updated on September 19, 2014.
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.