When comparing GNU Unifont vs Input Mono, the Slant community recommends Input Mono for most people. In the question“What are the best monospaced Unicode fonts?” Input Mono is ranked 3rd while GNU Unifont is ranked 10th. The most important reason people chose Input Mono is:
Many letter-forms are available in Input Mono, the width and line-height of which are changeable. There are also non-monospaced sans and sans-serif forms available.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Unicode support
This font covers the entire BMP and work is still being done to expand it even further.
Pro Customizable
Many letter-forms are available in Input Mono, the width and line-height of which are changeable. There are also non-monospaced sans and sans-serif forms available.
Pro Great on small-sized, high-resolution screens
Input Mono is designed to look good on HiDPI and low-resolution screens of variable zoom levels.
Pro Free for private use
Pro Large punctuation
The punctuation symbols are larger than in other traditional fonts, making for greater visibility.
Pro Non-monospaced sibling fonts
In addition to the monospaced variant, the Input family of fonts includes serif and non-serif proportional font families.
Cons
Con The zero character is not sufficiently distinguished from the capital "O" character
Especially for programming, zero characters should have slashes to make them distinct from other circular or oval characters.