Qualcomm Snapdragon 665 Advantages
More modern manufacturing process (11nm vs 14nm)
Released 3 years and 5 months late
Samsung Exynos 8890 Advantages
Better graphics card performance FLOPS (0.2496 TFLOPS vs 0.2432 TFLOPS )
Larger memory bandwidth (26.82GB/s vs 14.9GB/s)
Higher Frequency (2300MHz vs 2000MHz)