The Intel Core Ultra 5 235F is the objective winner of this comparison, securing victories in eleven out of fourteen measured specifications. While the Intel Core i5-9400F maintains a 43% advantage in Max Turbo Power, the Intel Core Ultra 5 235F dominates the technical landscape with a massive 1233% advantage in L2 Cache. This substantial lead in cache capacity represents the most significant performance differentiator between these two processors.

Users prioritizing raw cache capacity for modern computing tasks should select the Intel Core Ultra 5 235F, as it outperforms the alternative across the vast majority of measured categories. Conversely, the Intel Core i5-9400F remains the appropriate choice for those specifically seeking the higher Max Turbo Power rating provided by that older architecture. Your decision should rely on whether your workload benefits more from the expanded cache or the specific power profile of the i5-9400F.