When comparing Wally vs Flud, the Slant community recommends Wally for most people. In the question“What are the best Material Design apps?” Wally is ranked 32nd while Flud is ranked 54th. The most important reason people chose Wally is:
The app allows searching for wallpapers by text and tags as well as allows filtering them by categories, resolution, and/or aspect ratio.
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Pros
Pro Lots of different ways to find wallpapers
The app allows searching for wallpapers by text and tags as well as allows filtering them by categories, resolution, and/or aspect ratio.
Pro Has a huge selection of high quality wallpapers that's constantly updated
The app uses wallhaven.cc as the source for wallpapers. Wallhaven.cc, the successor of wallbase.cc, is a vast resource for high quality wallpapers.
Pro Encryption, IP filtering, and proxy support
Pro Top of the line UI
Flud uses Holo UI, so everything runs smoothly and looks great.
Pro Can be run in the background
Includes "keep running in background" option that can be accessed from the settings menu.
Cons
Con app not available in play store
Con Buggy
Multiple people are reporting that the app can sometimes crash or crash the launcher or not work properly in some other way.