If money is no object you should not be buying anything but a shield there the best hands downNever had nvidea shield doubt ever will. But where you have devices with next level hardware you expect it to be top of the food chain.
Firestick 4k, Z8 probably are great but the ultimate is the shield if you have the money. Question is would you really need the shield and wouldnt it be a bit excessive just to use for IPTV.