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This question is pretty subjective, but a good place to find some of the best fonts (for free) is google web fonts.
ProImmutable data structures out of box
ProBase language Clojure is very good
ProLive interactive programming with figwheel
SuccessfulTammuz (30 karma) recommendsGoogle Noto Fonts
Clean clear text. Nothing I’ve seen has been easier to read; on led, lcd, and eInk. Be it on a handheld or a 50 inch tv as a monitor.
ProScalable from 4 point to 500 without broken edges
ConNot yet universal
Good lightweight editor. With the package 'SublimeCodeIntel' it's one of the best leading free text editors.