The present work investigates the relative effectiveness of “nanoplatelet”-type graphenic carbons [viz., graphene oxide (GO), reduced graphene oxide (rGO)] and “nanofiber”-type multi-walled carbon nanotube (MWCNT) as reinforcement in ceramic matrix. The implications of possible departure in effective reinforcement content from the desired amount during processing of GO-incorporated composites and the relative influences of geometry/morphology of rGO versus MWCNT reinforcements have been revealed here. Monolithic and GO/rGO/MWCNT-reinforced aluminoborosilicate (ABS) glass-ceramics, having the same initial reinforcement content (i.e., prior to processing), have been prepared and their mechanical/tribological properties have been examined. The results indicate that removal of non-carbonaceous constituents of GO during calcination/sintering step (due to in-situ GO → rGO conversion) of GO-reinforced composite lowers the effective reinforcement content by ∼50% of the intended value; unlike when pre-reduced/exfoliated rGO is incorporated. Therefore, ABS-GO composite exhibits only modest improvement in wear resistance (by ∼20% w.r.t. ABS), as compared to ∼33% and ∼45% improvements for ABS-MWCNT and ABS-rGO, respectively. Furthermore, the superior performance of ABS-rGO versus ABS-MWCNT is attributed to the greater specific surface area and 2D-morphology of rGO, accruing tribo-surface coverage and crack-bridging. These findings address the debates concerning the respective reinforcing efficacies and highlight rGO's potential as a cost-effective-cum-superior reinforcement for developing wear-resistant ceramics.