In the Democratic Republic of the Congo (DRC), the object-based approach (OBA) still remains mainstream in the basic nursing education program, despite the intention of the Ministry of Public Health to expand the competency-based approach (CBA) nationwide. This study aimed to compare the clinical competency of nurses trained with CBA and OBA. A cross-sectional, mixed study was conducted. We developed a self-assessment questionnaire consisting of an individual demographic information, a clinical competency assessment scale and the General Selfefficacy Scale. Nurses trained with CBA or OBA and currently working in health facilities with two to five years of clinical experience were purposively selected from ten cities across nine provinces in the DRC. We also conducted key informant interviews with the clinical supervisors at health facilities. In a comparison of 160 nurses trained with CBA and 153 with OBA, 3 competency domains ("establishing professional communication", "making decisions about health problems", and "performing nursing interventions") of the 5 domains required for nurses had significantly higher scores in the CBA group. The key informant interviews supported these results while revealing various issues in the basic nursing education program. The results support the strategic direction of the Ministry of Public Health in the DRC to expand CBA. Collaboration among education institutions, health facilities, and administrative bodies is crucial for clinical nurses to fully engage their competencies for the population. Other low-and middle-income countries with scarce resources can refer to the developed and implemented competency assessment method applied in this study.