Qualcomm Snapdragon 665 Advantages
Lower TDP (5W vs 9W)
Samsung Exynos 990 Advantages
Better graphics card performance FLOPS (1.126 TFLOPS vs 0.2432 TFLOPS )
Larger memory bandwidth (44GB/s vs 14.9GB/s)
Higher Frequency (2730MHz vs 2000MHz)
More modern manufacturing process (7nm vs 11nm)
Released 6 months late