Samsung Exynos 7904 Advantages
Lower TDP (5W vs 9W)
Released 6 months late
Qualcomm Snapdragon 670 Advantages
Better graphics card performance FLOPS (0.3584 TFLOPS vs 0.0493 TFLOPS )
Higher Frequency (2000MHz vs 1800MHz)
More modern manufacturing process (10nm vs 14nm)