Of course, this is all very subjective, but I do find Fira Code to be a beautiful coding font. I also appreciate having ligatures in fonts nowadays. Fira Code was my go-to for a long time, but I've come to increasingly use Jetbrains Mono which is available under the same Open Font Licence and is quite similar (although slightly preferable visually to me).
https://www.jetbrains.com/lp/mono/