When comparing Proggy Clean vs Bitstream Vera Sans Mono, the Slant community recommends Proggy Clean for most people. In the question“What are the best programming fonts?” Proggy Clean is ranked 42nd while Bitstream Vera Sans Mono is ranked 69th. The most important reason people chose Proggy Clean is:
All characters are completely readable in the smallest size. Perfectly usable in terminal and code editors in 12px text size.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
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.
Pro Compact
You can fit a lot of text on the screen.
Pro Font proportion is perfect
Width is just right (not too narrow, not too wide). Many other fonts lack this.
Pro Smooth with antialiasing
Smooth at small sizes while still clear.
Pro Readable at small sizes
All characters are easy to recognize at small sizes (comma, period, etc).
Pro Easy to read
This is subjective but this font is very easy to read. The letters are all spaced and sized properly.
Cons

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.
Con Line doesn't cover text right
When using Neomutt or htop, the line drawn over is too low - the top of the characters cut into the top of the line.
Con "mp" clump together with smaller sizes
E.g. in "The quick brown fox jumps over the lazy dog".
