I'm waiting for the mate to be announced before i make a decision. Right now, the xl is slightly ahead of the note 8 for me but with the right specs, carrier compatibility and price i will definitely consider the mate.
If the mate 9 is any indication, I'll have to lose the removable battery from my v20 but get to keep the ir blaster and sd card slot. Bummer that none of these 3 phones support TMobile's 600mhz spectrum though