The Intel Core Ultra 9 285 is the objective winner of this comparison, securing victory in eleven out of sixteen measured specifications. Its most significant technical advantage is its L2 Cache, which is 433% larger than that of the alternative. While the Intel Core i5-12400 remains competitive in three areas, the superior cache capacity of the Ultra 9 285 establishes it as the more advanced component across the majority of the evaluated hardware metrics.

Users prioritizing high-end technical specifications and the substantial cache advantage should select the Intel Core Ultra 9 285 for their build. Conversely, the Intel Core i5-12400 is the better choice for budget-conscious buyers, as it holds a 65% advantage in MSRP. Choosing between these two processors depends on whether your primary requirement is the expanded cache capacity of the Ultra 9 285 or the cost-efficiency provided by the i5-12400.