When comparing Wally vs Facets, the Slant community recommends Facets for most people. In the question“What are the best wallpaper apps for Android?” Facets is ranked 1st while Wally is ranked 2nd. The most important reason people chose Facets is:
All artwork was made by one person, Justin Maller, centered around the concept of facets. As such the images, while different, feel stylistically cohesive.
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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 Cohesive style
All artwork was made by one person, Justin Maller, centered around the concept of facets. As such the images, while different, feel stylistically cohesive.
Pro A year's worth of images
The collection includes 365 wallpapers so you can have a different background image each day.
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.
Con Images could be higher resolution
All images are 1080p while many phones nowadays are coming out with QHD displays.