Samsung galaxy tab 3 is very laggy to the point of being useless. A much more powerful tablet is required. The NVIDIA shield gets a lot of votes on the Android platform
IMO 4k may not go the way of 3D and BLURAY both not used much at all but is perhaps a bit overkill. I opted for the Advance and the extra battery which not going for the pro bought me.
A saving OF £70 on the advanced version. Not enough to have all the problems of shipping it back. However buying a pro version with the extra battery and the backpack is probably worth a bit of a hassle.