NB-IoT: 180 kHz bandwidth, 1.5 – 10 second latency, Excellent indoor penetration, Less than 100 Kbps peak data rate, Best at low rates of power consumption, Used for specific needs.
LTE-M: 1.4 MHz bandwidth, 50 – 100 ms latency, Good indoor penetration, Greater than 384 Kbps of peak data rate, Best at medium to high rates of power consumption, More commonly used.