The Simplest Decision Rule
If you mostly support project work, CAPM is usually the stronger choice. If you already lead planning, coordination, trade-offs, and stakeholder decisions, PMP is generally the better signal. The mistake most candidates make is chasing the more prestigious credential before they can apply the scenarios it tests.
What Changes Between Them
Foundational
CAPM
Terminology, process groups, entry-level project structure
Applied
PMP
Leadership decisions, governance, scenario judgment
Coordinator
Best CAPM fit
Analyst, junior PM, delivery support
Lead
Best PMP fit
Project manager, delivery manager, PMO lead