Intel Core i3 9350KF's Advantages
Higher base frequency (4.0GHz vs 3.4GHz)
Lower TDP (91W vs 150W)
Intel Core i9 12900KS's Advantages
Released 3 years and 3 months late
Integrated graphics card
Higher specification of memory (DDR5-4800 vs DDR4-2400)
Larger memory bandwidth (76.8GB/s vs 37.5GB/s)
Newer PCIe version (5.0 vs 3.0)
Larger L3 cache size (30MB vs 8MB)
More modern manufacturing process (10nm vs 14nm)