When comparing AdAway vs Zenkit, the Slant community recommends AdAway for most people. In the question“What are the most useful Android phone apps?” AdAway is ranked 2nd while Zenkit is ranked 13th. The most important reason people chose AdAway is:
Use the hosts files to block ads, so it works for everything.
Specs
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Pros

Pro System wide blocking
Use the hosts files to block ads, so it works for everything.

Pro Doesn't consume CPU time or memory
The app updates the hosts file periodically but doesn't need to run in the background in order to block ads, which is especially convenient for older phones.
Pro Can use systemless host
Can be used without modifying the system if rooted with magisk.
Pro Can use custom host files
Lots of people and keep their own updated host files used for blocking ads and ad away supports loading them in or even adding their source for autoloading.
Pro Powerful and simple to use tool with a clean design
Easy to use and easily understandable for everyone.
Pro Many important data views
Data views include Mind-Map, Kanban-Board, Spreadsheet, List, and Calendar. Views can be switched easily.
Pro Native apps
Native apps for iOS, Android, macOS, Windows, and Linux.
Cons

Con Needs root (by design)
Needs root to update the hosts file.
Con Won't block same domain ads
Because the host file can only redirect domains, if the ad and content are on the same domain the ad will be displayed.
