I think sans-serifs are better for small body text because of the limited amount of available pixels, especially ones that are created with screens in mind and

I think sans-serifs are better for small body text because of the limited amount of available pixels, especially ones that are created with screens in mind and are specifically handhinted to facilitate clarity and crispness. Serifs are generally more appealing to the eye, but with limited resolutions (say, to 150ppi) can be shown in their full glory only in bigger sizes, making them great for titles on websites. My favorites are slab-serifs (Rockwell and Chunk Five work nice) or transitional serifs (I like Playfair Display) for titles, and something like Open Sans or Helvetica Neue for body text. Looks great :)