Spin-orbit torque can drive electrical switching of magnetic layers. Here, we report that, at least for micrometer-sized samples, there is no simple correlation between the efficiency of dampinglike spin-orbit torque (ζDLj) and the critical switching current density of perpendicularly magnetized spin-current generator-ferromagnet heterostructures. We find that the values of ζDLj based on switching current densities can either under- or overestimate ζDLj by up to 10 times in a domain-wall depinning analysis, while, in the macrospin analysis based on the switching current density, ζDLj can be overestimated by up to 1000 times. When comparing the relative strengths of ζDLj of spin-current generators, the critical switching current densities by themselves are a poor predictor. © 2021 American Physical Society.