When comparing Reddit is fun vs RedReader, the Slant community recommends Reddit is fun for most people. In the question“What is the best Reddit app for Android?” Reddit is fun is ranked 4th while RedReader is ranked 11th. The most important reason people chose Reddit is fun is:
Reddit is fun's UI feels familiar for Reddit users.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Accurately recreates the reddit experience
Reddit is fun's UI feels familiar for Reddit users.
Pro Multireddit support
Allows you to use multireddits you create on the website.
Pro Night mode
Allows for easier reading in the dark as there is less light to annoy the eyes.

Pro Sync between desktop support
The app combined with 3rd party sync applications helps show links you've already viewed. Sometimes it misses a few, but it's close most of the time.
Pro Tablet support
A recent update has added tablet support to Reddit is fun.
Pro Support for Reddit Gold
Reddit is fun allows you to use special features earned by having reddit gold such as syncing visited links between reddit is fun and the browser site.

Pro Cards theme
Usable WIP of a cards them available.
Pro Amoled mode
The Amoled mode turns the background to complete black, which emits no light on Amoled panels. This not only looks cleaner, but also saves battery. Phones without Amoled panels can still select this mode - it is a bit darker than the material dark mode.
Pro Ads are optional in the free version
The free version allows the option to disable ads, so you only need to turn them on if you wish to support the developer or use moderator features.
Pro Samsung Multi-tasking compatible
Reddit is Fun has the ability to be used in milti-window mode on high end Samsung phones. It can also be used in pop-up view (drag the corner of the screen towards the middle to shrink the app to about 1/2 size, or keep it as a bubble similar to FaceBook's chat heads feature).
Pro Embedded moderator functions
Has functionality for removing/approving posts/comments, removing as spam, reading/replying to mod-mail, distinguishing comments.

Pro Simple navigation
Scrolling and swiping actions make for an intuitive interface that is easy to control.
Pro Free with no ads/tracking
The app is completely free and there is no tracking through advertisement since there are none. For those that are security conscious on their devices this makes a great choice for a Reddit app.
Pro Truly Ad-free
No ads, open-source.

Pro Clean UI
The user interface is simple in its layout making it easy to read and use.

Pro Open Source
RedReader is completely open source meaning the code is available for anyone to look at or use. It's a completely open environment for understanding the app if one is so inclined.
Cons

Con Unrefined UI
The UI and UX lack the visual and functional polish of competing apps.
Con Problems displaying .gifv videos
Con Tends to crash
Memory leaks and other bugs cause crashing, especially on low RAM devices.
Con Does not start gif/video with muted audio
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