Qualcomm Snapdragon 425 Advantages
Lower TDP (5W vs 9W)
Samsung Exynos 990 Advantages
Better graphics card performance FLOPS (1.126 TFLOPS vs 0.024 TFLOPS )
Larger memory bandwidth (44GB/s vs 5.34GB/s)
Higher Frequency (2730MHz vs 1400MHz)
More modern manufacturing process (7nm vs 28nm)
Released 3 years and 8 months late