The Intel Core i9-9900K is the objective winner of this comparison, securing five spec victories compared to two for the Intel Core i7-8700K. The most significant advantage offered by the i9-9900K is its total core count, which represents a 33% improvement over the i7-8700K. While both processors share seven identical specifications, the superior core architecture of the i9-9900K establishes it as the more capable hardware option based on the provided data.

Users prioritizing maximum core density should select the Intel Core i9-9900K to leverage its 33% advantage in that category. Conversely, those focused on initial acquisition costs should choose the Intel Core i7-8700K, as it holds a 26% advantage in MSRP. If your primary requirement is high-core performance, the i9-9900K is the logical choice, whereas the i7-8700K remains the more economical option for users who do not require the additional core capacity.