When comparing PT Mono vs GNU Unifont, the Slant community recommends PT Mono for most people. In the question“What are the best programming fonts?” PT Mono is ranked 14th while GNU Unifont is ranked 66th. The most important reason people chose PT Mono is:
PT Mono uses slashed zeros and a rounded lowercase "L", while all numbers are easily distinguishable.
Specs
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Pros
Pro Clear characters
PT Mono uses slashed zeros and a rounded lowercase "L", while all numbers are easily distinguishable.
Pro Crisp on display
No pixelation on high pixel density displays.
Pro Clearest parentheses/braces/brackets
You will read ({[ something like this with PT Mono smoothly on screen on any size and quality.
Pro Unicode support
This font covers the entire BMP and work is still being done to expand it even further.
Cons
Con No ligatures
Con Lower t stem is short, too similar to lower c
Preferentially, lower f, i, r, have feet, however fortunately lower l (ell) is tailed.
Con No Greek letters
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.