Qualcomm Snapdragon 821 Advantages
Better graphics card performance FLOPS (0.3343 TFLOPS vs 0.0816 TFLOPS )
Higher Frequency (2342MHz vs 2000MHz)
Unisoc Tiger T618 Advantages
More modern manufacturing process (12nm vs 14nm)
Lower TDP (10W vs 11W)
Released 3 years late