The Intel Core i3-14100 is the objective winner of this comparison, securing victory across seven measured specifications. Its most significant technical advantage is its maximum memory capacity, which is 200% better than that of the alternative. While the Intel Core i9-9900K maintains a lead in six categories, the superior memory support provided by the newer model establishes it as the more capable option based on the total count of winning specifications.

Users prioritizing high-capacity memory support should select the Intel Core i3-14100 for their system builds. Conversely, those who require a higher total core count should choose the Intel Core i9-9900K, as it offers a 100% advantage in that specific area. Your final decision should depend on whether your primary computing needs favor the expanded memory ceiling of the newer processor or the increased core density found in the older model.