Qualcomm Snapdragon 439 Advantages
Higher Frequency (2000MHz vs 1800MHz)
More modern manufacturing process (12nm vs 14nm)
Released 1 years late
Qualcomm Snapdragon 450 Advantages
Better graphics card performance FLOPS (0.1152 TFLOPS vs 0.0432 TFLOPS )
Larger memory bandwidth (7.46GB/s vs 6.4GB/s)
Lower TDP (3W vs 5W)