In many countries choice of school is an increasing concern for families and governments. In Spain and Chile, it is also associated with a long-standing political cleavage on the regulation of large sectors of private-dependent schools. This article analyses both the micro- and the macro-politics of choice in these two countries, where low-status 15-year-old students record a significant segregation. At the micro level, some evidence is provided that not only middle-class skilful choosers but also the political representatives of private-dependent schools manage to pursue their interests drawing on economic, social and cultural capital. At the macro level, evidence also shows that the lobbies defending private-dependent schools can use and maintain these power resources. However, in some episodes collective action is an effective power resource for those who campaign in favour of a stricter regulation of these schools, but its influence is much difficult to maintain for longer periods. (Contains 2 notes and 2 tables.)