You need to look up the requirements at each school. Just because a school is based on quarters vs. semesters does not mean you will have more electives.
At most quarter schools, the average course load is less per quarter than taken at semester schools. The total number of credits earned over the 4-years is approximately the same. There is variation from one school to the next on total credits taken, regardless of whether they are on a quarter or semester system.
And all schools are not the same in terms of the requirements for the degree and core requirements. My son attends a semester school. While he had 7 courses covered from AP/summer classes, he is getting a Mechanical Engineering and Philosophy dual degree with a Music minor while studying abroad one semester in four years.