Prior research has shown that students from less educated families are less likely to study both science, technology, engineering and mathematics (STEM) subjects and arts and humanities subjects. This article used a large representative sample of university students in England to explore the relationship between students' enjoyment, perception of ability and socio-economic disparities in subject choices. Although these attitudes differed by students' parents' education level, and were associated with subject choices, disparities in choices persisted when accounting for these differences. Students with less educated parents were less likely to choose arts and humanities and more likely to study social sciences, law and business, over STEM, even when their enjoyment and perception of ability in subjects were similar. Students whose parents had higher levels of education were more likely to choose STEM over arts and humanities as their enjoyment of STEM increased, suggesting different underlying processes informing student choices by social background.