When comparing 6x13 fixed vs MonoLisa, the Slant community recommends 6x13 fixed for most people. In the question“What are the best programming fonts?” 6x13 fixed is ranked 37th while MonoLisa is ranked 54th. The most important reason people chose 6x13 fixed is:
6x13 fixed is the apex of bitmap fonts. It has a nice, defined character set and great proportions for quantity of text onscreen, making for excellent readability. It is aesthetically pleasing for a bitmap font and has been deservedly termed 'classic'.
Specs
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Pros
Pro Well designed
6x13 fixed is the apex of bitmap fonts. It has a nice, defined character set and great proportions for quantity of text onscreen, making for excellent readability. It is aesthetically pleasing for a bitmap font and has been deservedly termed 'classic'.
Pro Legible at small sizes
At a small text size, each character has a limited resolution. A character size of 6x13 pixels means only 78 pixels per character. Modern fonts are designed to be scalable and are less legible at these small sizes. Using bitmap fonts increases legibility by eliminating scaling and sub-pixel aliasing artifacts. Some scalable fonts include "ppems" embedded bitmaps for this reason.
Pro Available on every X server
6x13 is the classic fixed monospace bitmap font that is expected to be available on every X server. It is part of the misc-fixed family. These fonts were handcrafted for readability in a terminal.
Pro Widely available
It is distributed alongside the X Window System.
Pro Customizable OpenType features downloads
The website offers customizable downloads for editors that don't support OpenType features natively.
Pro Script variant
It comes with script variant for italics.
Pro Ligatures
The typeface supports over 120 optionally enabled ligatures for common coding tasks.
Pro Italics
The typeface comes with an italic version.
Pro Space
Space used by the characters has been carefully balanced to keep them light to read.
Pro Reading flow
The characters have been designed to flow into each other so that the font feels easy to read.
Pro Distinction
Specific care has been put to make programming characters such as 1, i, and l or O or 0 easy to tell apart.
Pro Wider than usual
As it's wider, this means there's more space for designing characters like "m".
Cons
Con Doesn't have a slashed zero
The absence of non-slashed zeroes makes it harder to distinguish "0" from the letter "O".
Con Extremely small on high-DPI screens
While it is crafted for a screen where the pixels are visible, bitmap fonts do not work well on high-DPI screens as they do not scale too well.
Con Not free
This font requires a purchase in order to be used. The cheapest version ('Basic') is 60 dollars. There is a free trial, though.
Con Wider than usual
As it's wider, this means a short adjustment period may be required. If you have a limited amount of horizontal space, the wider glyphs may be problematic as well.