The Intel Core Ultra 9 285KF is the objective winner of this comparison, securing victory in ten of the fourteen evaluated specifications. Its most significant technical advantage is its L2 cache, which offers a 1500% improvement over the Intel Core i9-10900K. While the older processor maintains a lead in one category, the newer model dominates the majority of the technical fields, establishing itself as the superior option based on the provided data.

Users prioritizing modern architecture and the substantial L2 cache advantage should select the Intel Core Ultra 9 285KF for their build. Conversely, the Intel Core i9-10900K remains a viable choice for budget-conscious buyers who prioritize the 17% better MSRP over the advanced technical specifications found in the newer model. Your decision should depend on whether you value the significant cache capacity increase or the cost-related advantage provided by the older hardware.