When comparing Monospace vs SF Mono, the Slant community recommends SF Mono for most people. In the question“What are the best programming fonts?” SF Mono is ranked 30th while Monospace is ranked 62nd. The most important reason people chose SF Mono is:
Code is very readable at both big and small sizes.
Question Ranking
Pros
Pro Supports Dropbox sync
Dropbox integration updates files in real time.
Pro Files are organized via hashtags instead of folders
You organize files by adding hashtags as the last line of a document. You can even use nested hashtags for greater control.
Pro Distraction-free
Monospace Writer's interface is clutter-free, there's nothing but text on the screen.
Pro Clear and dis·tin·guish·a·ble
Code is very readable at both big and small sizes.
Pro Best legible font
This font is legible in every condition.
Pro Beautiful with high pixel density
Cons
Con Hashtag-based organizational method might not feel intuitive
Using hashtags might take some to get used when transition from more common organizational methods like folder-based organization.
Con Apple is locking down this font
It's not open in any sense of the word. It even gives warnings if you try to rip it out of the Terminal.app or Xcode bundles. Obviously, Apple only wants it on their tools. This is such a shame. It should work in other editors, too. It's a beautiful font. Apple open sourced swift, why can't they be open with a monospace font?
Con Slightly difficult to use outside of Xcode, Terminal, or Console
The typeface isn't available in Font Book, etc. unless the user imports the files embedded in the apps above.