When comparing uBlock Origin vs AdAway, the Slant community recommends uBlock Origin for most people. In the question“What are the best ad blockers?” uBlock Origin is ranked 1st while AdAway is ranked 2nd.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Open source
Pro Light weight
Pro Promised to remain commercial interest free
uBlock will remain free from any commercial as stated by the creator. uBlock is meant to be strictly for the users and completely free.
Pro Lots of advanced features
For example, you can add more items to your HOST files like disable social tracking.
Pro Thoughtful UI
Its non-invasive design shows you how many times something's been blocked on a given web page – that number quickly jumps to the double- if not triple-digits in some cases.
Pro Can be used on Firefox Mobile
Pro Detects skimming
Skimming means replacing links so that they are rerouted, this is mostly a more friendly way to make money than showing ads.
Pro Edge version
Also available for Microsoft Edge browser.
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.
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.