I'm not quite sure why 950/950XL would have limited band support... according to Qualcomm, 808/810 has built-in support for:
Integrated X10 LTE, with Global Mode supporting LTE FDD, LTE TDD, WCDMA (DB-DC-HSDPA, DC-HSUPA), CDMA1x, EV-DO, TD-SCDMA and GSM/EDGE
Cat 9 speeds of up to 450 Mbps with...