An Enrolled Agent is a federally authorized tax practitioner who is licensed directly by the U.S. government. Enrolled Agents represent taxpayers on all forms of tax issues, from individual filing needs to audits, collections and appeals.
Enrolled Agent status is the highest tax credential awarded.
While Enrolled Agents specialize explicitly in taxation, CPAs are state licensed and regulated accounting experts who may (or may not) specialize in taxes.
Both professionals are generally well-suited to help with complex tax matters, although this can be highly dependent on the individual professional and their specific knowledge.
Further, both EAs and CPAs have stringent annual continuing education and ethic requirements.