Not just the catalogs, but also several semesters of past schedules may be needed to estimate the frequency of offering of each upper level CS course. Here is an example comparison from several years ago, but current offerings and frequency may differ now, so it should only be used as an example for building your own comparison, not as a basis for choosing colleges: Computer science at some smaller schools (including liberal arts colleges)
Also, some LACs, like other colleges, have overflowing interest in CS courses or majors, so they may have to impose some sort of limits. For example, Swarthmore limits the number of CS courses that CS majors can take.