When comparing Liberation Mono vs Code New Roman, the Slant community recommends Liberation Mono for most people. In the question“What are the best programming fonts?” Liberation Mono is ranked 17th while Code New Roman is ranked 49th. The most important reason people chose Liberation Mono is:
Liberation Mono works well with hinting on high-resolution displays.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Very readable
Liberation Mono works well with hinting on high-resolution displays.
Pro As of 2023: Second Best screen-modern drop-in replacement for MT Courier New
Metric-compatible with Monotype Courier New, dot 0 (zero), modern non-Kettler lowercase l (ell), 660+ glyphs, OFL-1.1 license
Pro Compact line height
Just like Courier New (the metrics of which this font emulates), its line height isn't too big, which results in more lines on the screen, compared to Consolas and several other more popular fonts.

Pro Has Bold typeface

Pro Completely free
Code New Roman is published under SIL Open Font License making it completely free.
Pro Looks clean and beautiful
Code New Roman seems like a mix of Monaco and Consolas, but looks very well on retina monitors.
Pro Comfortable to read
It's comfortable for the user to read Code New Roman for long periods. OpenType features include hanging or lining numerals (slashed, dotted, and normal zeros) as well as alternative shapes for a number of lowercase letters.

Pro Available for Windows and OS X
You can download and install it on Windows vista or higher (for cleartype technology support) and Mac OSX.
Pro Different typefaces
Code New Roman offers Regular, Bold , Italic, and Bold-Italic typefaces.
Pro Looks great on Ubuntu 14.04
Code New Roman has been tested on cheap Dell Inspiron with Ubuntu 14.04 installed and looks great on gtk-based apps such as Sublime Text, Geany, and TextAdept. It's also great on Qt-based apps such as KDevelop and Spyder. For electron/nwjs-based applications, it looks great on Visual Studio Code and Brackets, but has yet been tested on atom. However, it looks horrible on Swing-based apps such as Netbeans or Jetbrains' IDE.
Pro Multilingual
Code New Roman is available in English.

Pro Highly anti-aliased
This means that jaggies are reduced, making the line smoother.
Cons
Con Difference between "0" and "O" isn't clear
It can be difficult to tell the difference between the number "0" and the letter "O". However, the Fedora Project has a slightly altered version of Liberation Mono that fixes this with a dotted zero.
Con Liberation fonts are ugly
Con No updates
No updates or original publisher. Mostly edited and uploaded by many designers because of its OFL license.
Con Looks bad in Windows
Too much anti-aliased in Windows.
