Qualcomm Snapdragon 665 Advantages
Lower TDP (5W vs 6W)
Released 8 months late
HiSilicon Kirin 980 Advantages
Better graphics card performance FLOPS (0.5184 TFLOPS vs 0.2432 TFLOPS )
Larger memory bandwidth (34.1GB/s vs 14.9GB/s)
Higher Frequency (2600MHz vs 2000MHz)
More modern manufacturing process (7nm vs 11nm)