Geosynthetic reinforced soil walls (GRSWs) have become a popular alternative to conventional reinforced concrete walls, with geogrid and geocomposite materials being commonly used for reinforcement. Nonetheless, their performance can be adversely affected by inadequate drainage, particularly when backfilled with marginal soils and exposed to rainfall conditions. This study investigated the effect of geocomposite layers with inherent in-plane drainage attributes in combination with a vertical granular drainage layer on the performance of GRSWs. Numerical analyses using Finite Element Method (FEM)-based software examined transient seepage during rainfall, integrated with limit equilibrium analyses to assess stability. The study evaluated the impact of varying the number and placement of geocomposite layers to determine the optimal configuration. Results indicated that incorporating a vertical granular drainage layer with geocomposite reinforcement reduced pore water pressure due to improved drainage, enhancing stability. Geocomposites placed in the lower half of the reinforced zone proved more effective in mitigating water table rise. Minimal variations in pore water pressure and factor of safety were observed when the GRSW was reinforced with more than three geocomposite layers.