While visiting a newspaper for a project, I heard them talk about how it is better to use a sans-serif font for the body and a serif for the heading because it is easier to read. I think that's more true for printed stuff than on the screen though.
Source: I've worked with magazines and newspapers.
Just check any newspaper or magazine, they all use serif.
What makes you think that?
There are always exceptions, of course; Georgia was explicitly designed to be a screen typeface, and there are other serif fonts that look pretty readable once they're at 18px or higher sizes--which is perfectly reasonable as a web font size in today's world, rather than the 13px that everyone seemed to adopt circa 2000. And "high-DPI" displays make even more delicate serif fonts a lot more readable these days.
Personally, I tend to choose serif fonts for body typefaces even on the web nowadays, but tend to keep "UI" elements sans serif.
> … it is better to use a sans-serif font for the body … because it is easier to read. I think that's more true for printed stuff than on the screen though.
It’s truer for the screen rather than the print.