Samsung Exynos 880 Advantages
More modern manufacturing process (8nm vs 11nm)
Lower TDP (5W vs 6W)
Qualcomm Snapdragon 678 Advantages
Better graphics card performance FLOPS (0.3244 TFLOPS vs 0.2592 TFLOPS )
Higher Frequency (2200MHz vs 2000MHz)
Released 7 months late