When comparing Anonymous Pro vs Google Roboto Mono, the Slant community recommends Anonymous Pro for most people. In the question“What are the best programming fonts?” Anonymous Pro is ranked 9th while Google Roboto Mono is ranked 26th. 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 Looks really beautiful
Roboto Mono has a very clean and beautiful design.
Pro Clean and legible
Roboto Mono is crystal clear which makes it a good choice for reading code without your eyes getting tired.
Pro The right thickness
It's neither too thin, too fat, nor too condensed. Roboto Mono is just right.
Pro All variants available
Both bold and italics look great in Roboto Mono.
Pro Distinctive uppercase vs lowercase characters
The median line is placed relatively low. This makes reading mix-cased words (eg. hashes) easier.
Pro Readable, elegant and cute
It's very readable, elegant and cute. Almost indistinguishable with SF Mono at small point sizes. It looks great even as a display font.
Pro Makes for an excellent font for terminal
Roboto Mono looks particularly well on iterm2.
Pro Released under the lenient Apache License
Pro Powerline Patched version works well
This is the only font that works well and looks good with agnoster theme and powerline for bash/zsh.

Pro Looks great on HiDPI
Looks good at 14pt and lower, but looks great at 20pt and higher, making it an excellent font for higher resolutions
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 Curly braces aren't very distinctive
The curly braces are too close to parentheses, which can harm readability for programming.
Con Not recognized as monospace font
Windows does not recognize the font as monospaced. Cannot be used as terminal font.
Con Sublime Text doesn't show italic version
font face "Roboto Mono" has different widths for italic characters, disabling to prevent text reflow
