EVGA GS shouldn't be Tier 1. It's based on the Seasonic G platform and therefore should be in Tier 2 with the other units based on the platform, like Antec Edge, Antec TPC and of course the Seasonic G/S12G itself...
I wouldn't say it's worth the extra cash for the spec bump from Tegra 4 to K1 (especially if it's not the Denver K1), 5MP to 8MP camera, etc.
The Tegra Note 7 also comes with less bloatware then Xiaomi devices, and software updates come quicker.
What's your budget for one? A good place to start is the EVGA 850G2, but of course for more money there's better options available with higher quality components and/or higher wattage.
https://au.pcpartpicker.com/part/evga-power-supply-220g20850xr