"When in doubt, use a sans-serif typeface for the text in your visualization. Roboto, Lato, Open Sans, Source Sans Pro, and Noto Sans are all good options and free to use. None of them will make your visualization stand out, but all of them will be readable and pleasant to look at."

Je pense que tout est dit. Avant d'innover, faites en sortes que vos visuels soient lisibles :)