When comparing Anonymous Pro vs Proggy Clean, the Slant community recommends Anonymous Pro for most people. In the question“What are the best programming fonts?” Anonymous Pro is ranked 9th while Proggy Clean is ranked 42nd. The most important reason people chose Anonymous Pro is:
Anonymous Pro is easily legible at small sizes as a bitmap font.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Readable even at small sizes
Anonymous Pro is easily legible at small sizes as a bitmap font.
Pro The best rendering character for DIGIT ONE
Pro Clashing characters are clearly distinguishable
Characters that could be mistaken for one another (O, 0, I, l, 1, etc.) have distinct shapes to make them easier to tell apart in the context of source code.
Pro The easiest to read
All characters are completely readable in the smallest size.
Perfectly usable in terminal and code editors in 12px text size.
Pro Hipster among hipsters
Even hipsters will marvel at this font, praising you as the new hipster lord. It is best at around 19px (tested on Mac). Overall, it has better readability than many default fonts.
Cons
Con Small 'l' (ell) is too similar to big 'I' (Eye)
You can tell the difference but need to concentrate on the letters.
See the word "Illegal" as an example.
It would be better if serifs are a little bit wider for the big 'I' (Eye) letter.
Con Smaller than other monospace fonts
Con Small punctuation makes readability difficult
In some programs it's hard to see punctuation marks, especially periods and colons.
Con Smaller then other monospaced fonts
Size 13 of Source Code Pro is slightly larger then size 14 of Anonymous Pro.
Con "0" glitch
The 0 (zero) symbol has a 'dent' on the left.
Con Exaggerated italics
The italicized version of the font is too slanted, meaning that italicized comments in code look really unbalanced.
Con Hard to distinguish [ and {
Braces [] and {} are very similar.

Con Pixelated
This is, of course, intentional; but it can be hard to look at compared to other smooth mono-space fonts.
Con Smallest font sizes hard to read
Fonts less than 11pt start to fail readability tests. 9pt specifically has an additional issue where brackets don't align.
Con Not really good in all font-sizes
Completely clean pixels, no anti-aliasing so its best viewed in (n*12) pixel size.
Bold font-weight is not really good because of small padding between them.
