Cheapness aside haven't heard of any great after sales support from Hisense/Toshiba. Better to stick with xiaomi.The panel of the U80 are better I think. That panel goes upto 1400 nits and has more local dimming zones. Though I'd still buy this one due to how bad the VIDAA OS is and Toshiba has provided exactly 0 OS updates since launch.
I don't think the U80 is going to launch anyway. Hisense will announce the successor to the H9G/U8QF soon, so the U8080 is basically vapourware.