When comparing Polarity Browser vs Midori, the Slant community recommends Midori for most people. In the question“What are the best desktop web browsers?” Midori is ranked 23rd while Polarity Browser is ranked 36th. The most important reason people chose Midori is:
Midori is considerably fast. It starts up in no time and renders pages as fast as many other more well-known browsers.
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 Very fast
Midori is considerably fast. It starts up in no time and renders pages as fast as many other more well-known browsers.
Pro Lightweight
Incredibly lightweight with very little memory consumption.
Pro Allows using webapps as if they were desktop apps
Midori has a built-in functionality with which you can create web apps that can be launched from the desktop. For example, you can create a web app for the desktop to launch Gmail or YouTube or any other web app that you use.
Pro Available on several distributions
Midori is used as a default choice for a web browser for some distributions (like Elementary OS) and it's available for easy downloading for many other distros through their official repositories.
Pro Useful plugins are built-in
Some very popular and useful plugins are built-in and available out of the box. For example, there's an RSS feed reader plugin and an Adblocker built-in.
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 Development stalled
There have been no recent updates. Lags other browsers in supporting modern web standards. Many distributions have replaced it with other browsers.
Con Abandonned
Con Misbehaves with Google Web Apps
On some distributions Midori may not work very well for Google Web Apps. On openSUSE for example, Midori starts misbehaving when you are going through Google Drive's folder hierarchy.
Con Supports insecure cipher suites
This browser supports RC4 encryption which is known to be insecure compared to other encryptions such as AES.
Con Another bloatware as Firefox
It is described as a lightweight browser but it is just a bloatware. It crashes sometimes. It is a clone of Firefox which is said to be a RAM-eater.
Con Unfamiliar UI
The UI can take a little to getting used to because it's not very conventional or similar to other browsers. For example, it uses a trashcan icon to view recently visited links.
