Do colleges have more emphasis on GPA scores or on SAT scores?
Look at the CDS for the specific college. Most apply more weight to GPA, but both matter.
Generally GPA/Course Rigor/Class Rank matter more, but it depends on the school. The common data set of each school will list its priorities.
GPA is more important, but not by that much.
As stated in posts #1 and 2, check the CDS for various schools. In general GPA is more important but it varies. For instance here is Nebraska’s CDS. http://irp.unl.edu/CDS2013-14.pdf As shown in section C7 UNL has scores as Very Important and GPA as Considered.