Intel Core i3 9300T 's Advantages
Higher base frequency (3.2GHz vs 2.9GHz)
Lower TDP (35W vs 65W)
Intel Core i5 9400 's Advantages
Higher specification of memory (2666 vs 2400)
Larger memory bandwidth (41.6GB/s vs 37.5GB/s)
Larger L3 cache size (9MB vs 8MB)