Intel Core i3 8300 's Advantages
Higher base frequency (3.7GHz vs 2.9GHz)
Lower TDP (62W vs 65W)
Intel Core i5 10400 's Advantages
Released 2 years and 1 months late
Higher specification of memory (2666 vs 2400)
Larger memory bandwidth (41.6GB/s vs 37.5GB/s)
Larger L3 cache size (12MB vs 8MB)