When comparing Ghostery vs uBlock Origin (as a Firefox addon), the Slant community recommends uBlock Origin (as a Firefox addon) for most people. In the question“What are the best ad blockers for macOS?” uBlock Origin (as a Firefox addon) is ranked 2nd while Ghostery is ranked 4th.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Blocks many ads
As a side-effect of stopping trackers, Ghostery also disables many annoying advertisements, and with less of a performance hit than the various AdBlocks (especially when using both).
Pro Prevents you from getting tracked
Pro Fastest loading times
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.
Cons
Con Sells user data
Helps advertisers by selling user data. Though this can be turned off.
Con Doesn't block background ads yet
Ads that replace the background image of a website are currently beyond the scope of the ad-blocker, but the functionality is planned to be added in the future.