Adobe Source Code Pro vs Iosevka

The characters in Source Code Pro are easily readable. They have consistent widths across all weights as to not break up words. Commonly used programming symbols (such as various kinds of brackets) are made easily discernible from each other while various punctuation marks are made bigger than normal. This makes them especially good for programmers who keep staring at code for hours.

The characters have been made in such a way that they are easily discernible and usable regardless of font size, weight, and display.

The font is licensed under SIL open font license with source code available on GitHub. Being an open source font, it's also reasonable to expect incremental upgrades and additions to character sets and functionality.

Characters are evenly spaced, making for better readability.

The font works particularly well when it is in print.

The code comes with seven style variants: ExtraLight, Light, Regular, Medium, Semibold, Bold, and Black.

The beta release version of Source Code Pro introduced italicized characters on Jul 18, 2015.

The font is hosted on Google Web Fonts directory, meaning that it can be easily embedded in web pages.

Powerline symbols are useful for programmers to display a nicer status bar or mode-line on Vim and Emacs.

A version of Source Code Pro with support for common Haskell composite glyphs such as >>= is available here. An editor with ligature support, such as Leksah, is required.

The Light and Extra Light weights make the font less "bold" looking when reading.

Iosevka is very clear and legible on all displays and in all sizes.

Narrow character width uses horizontal screen space more efficiently.

This font comes in seven different weights, ranging from thin and extra-light to heavy.

There is full customization of styles and variants in Iosevka.

Iosevka is quite flexible in that it supports Cyrillic and Greek letters.

Iosevka is free and open source.

Includes characters for supporting Powerline/Airline for terminals and terminal editors.

Few fonts have a good ligation feature. Ligature characters (such as æ or the German ß) are supported in Iosevka and look just as you'd expect them to.

Many of the common styles are available, including Sans Serif and Slab Serif with normal, bold, italic, and bold italic styles.

IPA is a system containing the sounds of spoken language and includes speech qualities such as intonation.

Due to it being readable on all types of displays, Iosevka isn't hard on the user's eyes.

The developer is active and responds to user questions and issues.

Iosevka integrates CJK characters well, those being characters of the Chinese, Japanese, Korean, and occasionally Vietnamese languages.

For better reading longer texts.