Intel Core i5 8257U 's Advantages
Lower TDP (15W vs 28W)
Intel Core i5 1038NG7 's Advantages
Released 10 months late
Higher specification of memory (3733 vs 2400)
Larger memory bandwidth (58.3GB/s vs 37.5GB/s)
Higher base frequency (2.0GHz vs 1.4GHz)
More modern manufacturing process (10nm vs 14nm)