When comparing Apple Monaco vs Apple Menlo, the Slant community recommends Apple Menlo for most people. In the question“What are the best programming fonts?” Apple Menlo is ranked 3rd while Apple Monaco is ranked 12th. The most important reason people chose Apple Menlo is:
Equally well readable as Bitstream Vera/DejaVu Sans Mono, but with slashed zeros (aids with legibility).
Specs
Ranked in these QuestionsQuestion Ranking
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 Great readability
Equally well readable as Bitstream Vera/DejaVu Sans Mono, but with slashed zeros (aids with legibility).
Pro Easy on user's eyes
Characters are very 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 and various punctuation marks are made bigger than normal. This makes them especially good for programmers who keep staring at code for hours.
Pro Clear differentiations
I, I, L, l, 1, O, 0, etc.
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 No bold version
This is not so great on a dark IDE, the characters tend to wash out, unlike something like Consolas.
Con Seems too wide at size 16
The letters become quite wide at size 16, impacting upon readability.
Con Doesn't work at size 10
Menlo displays as expected for size 11 and bigger, but doesn't seem to work very well at size 10. Issues include zero not being the same height as the rest of the numbers and Parenthetical Brackets not matching up perfectly.