Intel Core i3 8130U 's Advantages
Lower TDP (15W vs 65W)
Intel Core i5 9400 's Advantages
Released 11 months late
Higher specification of memory (DDR4-2666 vs DDR4-2400)
Larger memory bandwidth (41.6GB/s vs 37.5GB/s)
Higher base frequency (2.9GHz vs 2.2GHz)
Larger L3 cache size (9MB vs 4MB)