Some people are positive that Serif typefaces are the right choice. They claim it's the old standard where the eyes more easily recognize words because of the small serifs which add to the details of the symbol (word).
Then, there are people who swear by the Sans Serif types, claiming it's much easier to recognize the symbols without the unneeded serifs.
Our experience tells us it is a matter of taste regarding which should be selected. Still, there are some aspects that should be considered:
Do you know the age of your readers in general?
Young people, especially children, usually prefer Sans Serif, while older people prefer Serif.
What is the message you want to send?
Texts which should reflect high authority/
Is your type size small?
Screens with lower pixel density* usually display Sans Serif types better in smaller sizes, as Serif has more curves and details.
How high is the PPI on the majority of your
Screens with higher density* display Serif types pretty well.
What kind of font rendering do your readers have?
Serif usually works better on Mac-OS/Ubuntu than Windows type of font rendering.
Do you plan to use multiple typefaces?
Perhaps you could combine both, Serif and Sans-Serif (as headlines and main text).