> If you’re us­ing a sans serif font, skip italic and use bold for em­pha­sis. It’s not usu­ally worth ital­i­ciz­ing sans serif fonts—un­like serif fonts, which look quite dif­fer­ent when ital­i­cized, most sans serif italic fonts just have a gen­tle slant that doesn’t stand out on the page.

http://practicaltypography.com/bold-or-italic.html