Intel Core i5 9600K 's Advantages
Higher specification of memory (2666 vs 2400)
Larger memory bandwidth (41.6GB/s vs 37.5GB/s)
Higher base frequency (3.7GHz vs 3.6GHz)
Larger L3 cache size (9MB vs 6MB)
Intel Core i3 9100 's Advantages
Released 6 months late
Lower TDP (65W vs 95W)