When comparing MT Andale Mono vs Monoid, the Slant community recommends Monoid for most people. In the question“What are the best programming fonts?” Monoid is ranked 19th while MT Andale Mono is ranked 32nd. The most important reason people chose Monoid is:
The user can adjust letter-spacing, line-height, and choose alternate characters prior to downloading.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Excellent legibility
It's easy to distinguish "0" from "O", "a" from "o", and "I" from "l" from "1".
Pro Good font variants
Boldface variant is not too heavy while italic face is not too spindly. Andale Mono contrasts with Source Code Pro, which is very similar in the regular font face.
Pro Customisable
The user can adjust letter-spacing, line-height, and choose alternate characters prior to downloading.

Pro Novel use of ligatures to display ascii character combinations as symbols
The common expression '!=' is displayed as '≠', '>=' as '≥' *, while maintaining the fixed width double-space that these characters would normally take, so as to maintain text alignment.
- Many others are supported too - see site for details.
Pro Open source
Monoid is open source meaning it's freely available to anyone.
Pro Sharpness
Pro Larger and easier to read with thin condensed letters
Pro Fine without retina
Probably the only one that is.
Cons
Con Not pure mono
Bold and italic are too wide, so it's not pure mono in combination with regular font.
Con Very narrow
Con No bold-italic style
Monoid doesn't offer a style that is both bold and italic.
