This full in-depth review video explains all the reasons why I chose the Samsung Galaxy Tab S 10.5 over the Apple iPad Air 2. This Video Review was shot with the Galaxy Note 4. Please note that the WiFi version comes with the Exynos 5 Octa 5420 processor whereas the LTE version comes with the Snapdragon 800 Processor.
As for the GPU, the Mali-T628 MP6 GPU is found in the Galaxy Tab S WiFI version and the Qualcomm Adreno 330 GPU is found in the LTE version. The rest of the specs are exactly the same.