Intel Celeron J4125 's Advantages
Released 10 months late
Lower TDP (10W vs 65W)
Intel Core i5 9400 's Advantages
Better graphics card performance
Higher specification of memory (2666 vs 2400)
Larger memory bandwidth (41.6GB/s vs 38.4GB/s)
Newer PCIe version (3.0 vs 2.0)
Higher base frequency (2.9GHz vs 2.0GHz)