Intel Core i3 9300 's Advantages
Integrated graphics card
Higher base frequency (3.7GHz vs 3.0GHz)
Lower TDP (62W vs 65W)
Intel Core i5 12490F 's Advantages
Released 2 years and 9 months late
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 (20MB vs 8MB)
More modern manufacturing process (10nm vs 14nm)