Qualcomm Snapdragon 439 Advantages
Lower TDP (5W vs 6W)
Qualcomm Snapdragon 860 Advantages
Better graphics card performance FLOPS (1.0368 TFLOPS vs 0.0432 TFLOPS )
Larger memory bandwidth (34.13GB/s vs 6.4GB/s)
Higher Frequency (2960MHz vs 2000MHz)
More modern manufacturing process (7nm vs 12nm)
Released 10 months late