Intel Core i3 9300 's Advantages
Lower TDP (62W vs 127W)
Intel Core i9 9900KS 's Advantages
Released 6 months late
Higher specification of memory (DDR4-2666 vs DDR4-2400)
Larger memory bandwidth (41.6GB/s vs 37.5GB/s)
Higher base frequency (4.0GHz vs 3.7GHz)
Larger L3 cache size (16MB vs 8MB)