The Intel Core Ultra 9 285 is the objective winner of this comparison, securing victory in eleven out of fourteen measured specifications. Its most impactful advantage over the Intel Core i5-9600K is its L2 cache capacity, which is 2567% larger. While the older processor maintains a lead in three specific categories, the newer model demonstrates a clear technical superiority across the vast majority of the evaluated hardware metrics.

Users prioritizing maximum cache capacity and modern hardware specifications should select the Intel Core Ultra 9 285 for their build. Conversely, the Intel Core i5-9600K remains the logical choice for buyers who prioritize a lower MSRP, as it holds a 52% advantage in that specific area. Your final decision should depend on whether your primary requirement is the significant cache performance boost or the cost-saving benefit provided by the older component.