typography

Watched Helvetica , so now I'm exploring meanings underneath typograpy:

serif : historical, calligraphy, elegance (?) / complex, archaic
serif : historical, calligraphy, elegance (?) / complex, archaic
serif serif serif serif serif
sans-serif : simple, straight, quick, elegance (?) / brutal, simplistic
sans-serif : simple, straight, quick, elegance (?) / brutal, simplistic
sans-serif : simple, straight, quick, elegance (?) / brutal, simplistic
size matters too size matters too  size matters too size matters too
 So Anyway, should titles be Serifs or non-serifs? Should in-texts (texts in content bodies) be serifs or non-serifs?