Qualcomm Snapdragon 435 Advantages
Lower TDP (4W vs 5W)
Qualcomm Snapdragon 865 Advantages
Better graphics card performance FLOPS (1.2021 TFLOPS vs 0.0432 TFLOPS )
Larger memory bandwidth (44GB/s vs 6.4GB/s)
Higher Frequency (2840MHz vs 1400MHz)
More modern manufacturing process (7nm vs 28nm)
Released 3 years and 10 months late