This may be a particularly specific question, but I am at a point where I can choose to take additional mathematics courses in the final year of my degree to strengthen my transcript for grad school applications to Computer Science, but I am also able to choose to do an 8 month supervised research/project course (essentially an undergrad capstone/thesis equivalent).
Of course it depends on the schools, but in terms of general grad school admissions, would a personal project that requires a large amount of independent work show more strength than a few additional (but still important, some schools I've looked into list these as preferred prerequisites) math classes?