Which develop kit on Sixfab should I choose? Raspberry Pi 4G/LTE Cellular Modem Kit or IoT Kit?

our project is using the raspberry pi system, with some sensors like temp/fire, when these sensors are triggered, the 4G/LTE module can send the message or call the tel phone number for the notice. so which development kit should I choose for this application? can we edit the source code to control the sensors?

thanks in advance!