If it's me, I will choose the MIX 2S.
The MIX series is Xiaomi's premium flagship lineup afterall, and it has extra feature that the Mi 8 doesn't have such as wireless charging, which is good to have(some may disagree).
yea I would choose Mix2s over Mi8 just for this wireless charging feature but since Mix3 is rumored to be out in Sept, I am prepared to wait for Mix3 instead.

