When comparing Killer Cavern vs Wayward Souls, the Slant community recommends Wayward Souls for most people. In the question“What are the best roguelikes on Android?” Wayward Souls is ranked 8th while Killer Cavern is ranked 56th. The most important reason people chose Wayward Souls is:
Wayward Souls developer RocketCat Games has promised that there will never be any in-app-purchases added to the game nor will there ever be any paid updates.
Specs
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Pros

Pro Real-time
The gameplay is in real time, not turn based, so is a bit more like The Binding of Isaac or other roguelites.

Pro Free while in development
In order to test the development of the game the dev has made the game free while it is in development.
Pro No in-app-purchases or paid updates, the game has a singular price for all of the content
Wayward Souls developer RocketCat Games has promised that there will never be any in-app-purchases added to the game nor will there ever be any paid updates.
Pro Choice of character class gives the chance for different strategy and playstyles as well as something to strive for by unlocking them
There is a total of six characters that can be used in game with three to start and three unlocked through playing and beating the games dungeons. Each one feels unique and will have a different playstyle that will have to be used, making for varied gameplay.
Pro Good controller support makes for an easier way to control the game
Wayward Souls has support for MOGA controllers as well as HID bluetooth controller support.
Pro Fantastic touch screen controls that are responsive and easy to use
The touch screen controls in Wayward Souls handle beautifully, something many mobile games struggle with but work quite well here making for an enjoyable control experience.
Pro Easily played offline thanks to the game not needing an internet connection once installed
Wayward Souls allows for complete offline play, making for a good game to be played when there is no internet connection.
Cons
Con Short
It has been reported that the game can be beaten in under 5 minutes, so a bit short for those looking for something a to dig into for an extended period of time.
Con Can feel repetitive
Even though it is by design, having to repeat many of the same areas (despite being randomly generated) feels repetitive after a while, which can lead to boredom while playing. So it is up to the player how soon they will tire.
