Intel Celeron J4005 's Advantages
Higher base frequency (2.0GHz vs 1.7GHz)
Lower TDP (10W vs 35W)
Intel Core i5 8400T 's Advantages
Better graphics card performance
Higher specification of memory (2666 vs 2400)
Larger memory bandwidth (41.6GB/s vs 35.76GB/s)
Newer PCIe version (3.0 vs 2.0)