parang I read somewhere (in another forum) that they prefer the Minix U1 over the Shield... i'll look for that link so I can share it in here...
Depends on your purpose. I have been using NSATV months now. I am satisfied for the simple reason that I want to use it as a HT box.
I have been trying out games recently on shield. I get a console feel like how the games are made to work with the controller.
The price difference between Minix U1 and NSATV is big. You can game with U1but i am not sure if the quality of the games come near console feel since the user interface is not optimized for a third party controller.
If you want a HT box and occasional gaming and streaming. UI is better as the cost is well justified. But you have to spend for a third party game pad.
If you want a HT box,r regular gaming be it Native or emulator, streaming. Shield is suited for it. But you have to pay a premium. But remember that the game pad is already included unlike the U1.
If I have to choose now, I would probably get U1 because of the price of it. But I did not regret buying the shield. It payed for itself many times over.