This study aimed to investigate the microstructure and tribological properties of the equiatomic AlCoCrFeNi high-entropy alloys (HEAs) fabricated using selective laser melting (SLM) and spark plasma sintering (SPS) processes. Sliding wear behavior in a ball-on-disk configuration with a ball either above or below the disk of the SLM and SPS samples was investigated. A detailed study of the effects of wear debris on the sliding wear behavior was undertaken to clarify the effect of wear debris entrapment in a wear scar. The wear volumes in the as-built SLM samples were slightly higher than in the SPS counterparts in both configurations. Wear volume and coefficient of friction values in the ball-above configuration were significantly lower than in the ball-below configuration. The present results indicated that the wear debris significantly influenced the mechanical contact properties of the HEA, providing new insight into the performance of the new materials in various conditions that could be considered to widen classical approaches by including the fate of the detached particles in the wear process. The impacts of wear debris on the design and application of these novel alloys should be considered.