When comparing Root Explorer vs Greenify (Donation Package), the Slant community recommends Root Explorer for most people. In the question“What are the best ROOT apps for Android?” Root Explorer is ranked 1st while Greenify (Donation Package) is ranked 4th. The most important reason people chose Root Explorer is:
As the name would suggest root file access and editing is something Root File Explorer excels at. It was one of the first to have this function and is still one of the best.
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Pros
Pro Root file access and editing
As the name would suggest root file access and editing is something Root File Explorer excels at. It was one of the first to have this function and is still one of the best.

Pro SMB/CIFS network share support
Root Explorer supports SMB/CIFS network sharing.
Pro 24 hour refund policy
The Root Explorer devs have a 24 hour refund policy despite Google's 2 hour policy. All one needs to do is e-mail the devs within that 24 hour period to ask for a refund.
Pro Hibernate overly active apps to save battery
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 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 Has extra experimental features over the free version
The Greenify (Donation Package) has a few extra experimental features that the free version does not offer. They require ROOT and the Xposed module to be installed. Using these features can help with the compatibility of the rest of the Greenify app, which is a big plus.
Cons
Con UI feels dated
The UI of Root Explorer is not much to look at and feels a bit dated.
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.
