The Intel Core i3-14100 is the objective winner of this comparison, securing victory across eleven of the fourteen evaluated specifications. Its most significant technical advantage is the L2 cache, which is 233% larger than that found in the alternative. While the Intel Core i5-8400 maintains a lead in total core count by 50%, the superior cache capacity and broader spec-win count establish the newer processor as the more capable component across the majority of measured categories.

Users prioritizing modern architecture and the substantial L2 cache advantage should select the Intel Core i3-14100 for their build. Conversely, those who specifically require the higher total core count provided by the Intel Core i5-8400 should choose that model instead. By focusing on these distinct hardware differences, buyers can align their selection with the specific technical strengths that best suit their individual computing requirements.