How to quantify which font is "best" is a tricky question. I do flip through available programming fonts on occasion just to see if something feels right. A recent favorite is Monaspace Neon from Lettermatic. One detail actually is that I find I like zeros that are noticeably different than an uppercase letter 'O'. In Monospace Neon for example the zero has a dot in the middle.

Not like I need it for coding but technically or graphically I like the idea of fonts that have double with for CJK characters and it all tiles nicely.

Box drawing glyphs that line up correctly.

Readability and good looks.

Clear distinction between numerals and letters. O and 0, 1 and l, S and 5. Also distinctive punctuation. '.' and ',' are too similar in a lot of typefaces.