I guess the best coding font is one you are used to. My first font was MS Fixedsys but then on a friend advice I've tried terminus [1] and liked it. Since then I've tried many other fonts but none of them stuck with me like terminus did. The only downside probably is that while bitmap fonts looks pixel-perfect 3rd party TTF versions are not so good (and some terminals support only TTF/OTF).
[1] https://terminus-font.sourceforge.net/