Wireless Joint

Hi All! I live in an rural area with the closest tower around 5 miles. I'm using AT&T and the surrounding towers have bands 2, 5, 12, and 14; possibly band 30 but i think that tower is too far.
What's the major difference Quectel EM12-G CAT12 M.2 Modem and Sierra Wireless EM7511 CAT-12 LTE-A Pro ...