When comparing Polarity Browser vs Ghostery Browser, the Slant community recommends Ghostery Browser for most people. In the question“What are the best desktop web browsers?” Ghostery Browser is ranked 34th while Polarity Browser is ranked 36th. The most important reason people chose Ghostery Browser is:
The Ghostery ad blocker blocks all ads so that you don't get annoyed.
Specs
Ranked in these QuestionsQuestion Ranking
Pros

Pro Fast and lightweight
According to their own tests Polarity takes up more than 10x less memory than IE, FF or Chrome.
Pro Multi-session browsing with Parallel Sessions
Parallel Sessions allows users to browse the web with different profiles with separate cache, cookies, and history. This enables users to login to multiple accounts to different websites like Facebook.
Pro Built-in privacy features
Polarity browser comes with ad block and Do Not Track built in.

Pro Customizable UI
It allows you to customize many things from window color, tab color and text color to window transparency and border size. You can set Background image or use Shuffle from Bing. You can also save the theme, import and export it.
Pro Custom Developer tools
Polarity comes with the standard Inspector for Blink based browsers along with its custom client that works with both Trident and Blink.

Pro Great HTML5 support
Polarity scores 512/555 on the HTML5 test. It is just a couple of points shy of Google Chrome.
Pro Built-in ad blocker
The Ghostery ad blocker blocks all ads so that you don't get annoyed.
Pro No tracking
Pro No telemetry on mobile
There is no telemetry on mobile, except if you go to their support page and start a tutorial.
Pro Lightweight
Cons

Con Few annoyances left unchecked
The browser has a couple of bugs such as where extensions are not actually ran after installation despite a notification stating that they are.

Con Windows and Android only
No Linux, OSX or iOS version available.
Con Unstable and frequent crashes
Though the browser is really lightweight and lightning fast, it crashes many times and is clearly unstable.
Con Uninstallation problems
Polarity browser can only be uninstalled with a built-in deinstallation tool. This is very impractical.
Con No add-ons support
There is no add-ons support, except on desktop platforms.
Con Outdated search engines
It uses the Clickz search engine as a search engine which was already discontinued in 2020.
Con Just like Ghostery this is software by an ad agency
Con Ghostery ad blocker doesn't block all, but "selective" and sends on personal data.
Since July 2018, with version 8.2, Ghostery shows advertisements of its own to users.[23] Burda claims that the advertisements do not send personal data back to their servers and that they do not create a personal profile.[24] (Wikipedia)
Con Way too similar to Mozilla Firefox
