Arial. I've tried other fonts and some just aren't that readable at certain sizes, especially since EQ text isn't exactly anti-aliased (aka it's jagged). The UI only supports a limited number of fonts, so alas, I can't use Coolvetica or Edwardian Script...or everyone's country rock star starving artist uncle's favorite, Bleeding Cowboy :P
For readability, sans serif fonts are really the best. Arial is functional, Comic Sans will successfully troll a third of the community when you post screen shots, and Times New Roman can be hard to read unless you make things a little larger. Monospace/coding fonts will make you feel like you're in a fantasy programming matrix
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