I think colleges want both - but it’s easier to sell yourself as a spiky kid. I had one of each. The spiky CS kid had ECs that were either academic or CS related. The other kid majored in IR. His SAT verbal score was 100 pts more than math, but he took BC Cal and two science APs. He took also took all the history APs. His ECs were four years of two orchestras, four years of Science Olympiad (state level medals in Ecology), a couple of years of literary magazine, and he made origami earrings and sold them at local art galleries. He applied as undecided. They both did fine. Younger one, did somewhat better than expected.