Qualcomm Snapdragon 435 Advantages
Lower TDP (4W vs 7W)
Released 10 months late
Samsung Exynos 7420 Advantages
Better graphics card performance FLOPS (0.1976 TFLOPS vs 0.0432 TFLOPS )
Larger memory bandwidth (24.8GB/s vs 6.4GB/s)
Higher Frequency (2100MHz vs 1400MHz)
More modern manufacturing process (14nm vs 28nm)