When comparing Reddit is fun vs Boost for reddit, 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 5th while Boost for reddit is ranked 8th. 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 Night mode
Allows for easier reading in the dark as there is less light to annoy the eyes.
Pro Multireddit support
Allows you to use multireddits you create on the website.
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 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 Embedded moderator functions
Has functionality for removing/approving posts/comments, removing as spam, reading/replying to mod-mail, distinguishing comments.

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 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 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 Highly customizable
There is a huge variety of ways you can customize the app. Many theme color combinations, different ways to customize the display, lots of filter options and more.
Pro Follows material design
Follows the same design theme that Android uses.
Pro Amazing Darkmode
Pro Swiping gestures
Configure swipes up on pictures to return to sub, slide left/right through album. Swipe in from a side for the subreddit sidebar (configurable), and more.
Pro Comprehensive media handling
Select to choose whether or not you want to load gifs, gfycats, movies, pics, and more (link types, e.g. youtube) within the app or externally. Can also select whether to use Chrome Custom Tabs.
Pro Many display options
Pro Comment formatting
Collapse comments and improve visibility
Pro Quick switch for display changing
Pro Many features
Great developer who keeps updating the app
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 Intrusive ads
The ads cause your phone to vibrate and have other annoying issues (like causing your media volume to drop if you're listening to music).
Con No "always on" feature
While watching a gif or video, a phone starts to get dim and eventually lock. Need always on feature like Reddit App.
Con Hard to navigate to and from site and comments
Built By the Slant team
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