Intel Core i5 9400F 's Advantages
Higher specification of memory (DDR4-2666 vs DDR4-2400)
Larger memory bandwidth (41.6GB/s vs 37.5GB/s)
Larger L3 cache size (9MB vs 6MB)
Intel Core i3 9100T 's Advantages
Integrated graphics card
Higher base frequency (3.1GHz vs 2.9GHz)
Lower TDP (35W vs 65W)