Intel Core i5 8259U 's Advantages
Better graphics card performance
Lower TDP (28W vs 35W)
Intel Core i5 9600T 's Advantages
Released 1 years late
Higher specification of memory (2666 vs 2400)
Larger memory bandwidth (41.6GB/s vs 37.5GB/s)
Larger L3 cache size (9MB vs 6MB)