When comparing Apple Monaco vs Liberation Mono, the Slant community recommends Apple Monaco for most people. In the question“What are the best programming fonts?” Apple Monaco is ranked 12th while Liberation Mono is ranked 17th. The most important reason people chose Apple Monaco is:
Monaco's rendering is similar to that of Consolas but slightly more playful. Each character seems to be a tiny bit larger when compared to Consolas, yet code takes up the same amount of space.
Specs
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Pros
Pro Easy on user's eyes
Monaco's rendering is similar to that of Consolas but slightly more playful. Each character seems to be a tiny bit larger when compared to Consolas, yet code takes up the same amount of space.
Pro Good differentiation between clashing characters
The curly braces are easily distinguishable from parentheses, "0" is distinguishable from "O", and "1" is distinguishable from "l", to name but a few.
Pro Beautiful braces, perfect parens
Parentheses are half-circles. Square brackets, half-squares. Curly braces, unmistakable. Geometric, classy, fun, and most importantly clear.
Other fonts' bracket delimiters might start to look lifeless and wilted.
Especially well-suited to those who color their brackets as the colors show even against light backgrounds.
Pro Excellent legibility at non-antialiased small sizes
This font shines for legibility at non-antialiased small sizes. It was originally designed as a 9 pt bitmap font. This is excellent for when maximizing on-screen code is a priority.
Pro Small file size
Even if you are struggling with memory, this font is no concern. Its ttf file is just about 50 kb.
Pro Very readable
Liberation Mono works well with hinting on high-resolution displays.
Pro As of 2023: Second Best screen-modern drop-in replacement for MT Courier New
Metric-compatible with Monotype Courier New, dot 0 (zero), modern non-Kettler lowercase l (ell), 660+ glyphs, OFL-1.1 license
Pro Compact line height
Just like Courier New (the metrics of which this font emulates), its line height isn't too big, which results in more lines on the screen, compared to Consolas and several other more popular fonts.
Pro Has Bold typeface
Cons
Con Only comes with Mac OS X
While it generally only came with OS X, you can try here for installing on other platforms.
Con Ability to select different anti-aliasing grades was dropped
Before OS X Snow Leopard, it was possible to apply varying degrees of anti-aliasing to the font. At present, the previously "medium" anti-aliasing option is the only choice.
Con Difference between "0" and "O" isn't clear
It can be difficult to tell the difference between the number "0" and the letter "O". However, the Fedora Project has a slightly altered version of Liberation Mono that fixes this with a dotted zero.