Qualcomm Snapdragon 660 Advantages
Lower TDP (5W vs 9W)
Samsung Exynos 1080 Advantages
Better graphics card performance FLOPS (1.024 TFLOPS vs 0.2176 TFLOPS )
Larger memory bandwidth (44GB/s vs 13.9GB/s)
Higher Frequency (2800MHz vs 2200MHz)
More modern manufacturing process (5nm vs 14nm)
Released 3 years and 6 months late