Both CalAmp (NASDAQ: CAMP) and Sierra Wireless (NASDAQ: SWIR) are making big plays on the machine-to-machine (M2M) communication segment and the broader Internet of Things (IoT) market. IDC estimates that by 2020, companies will spend $1.29 trillion annually on the IoT, but even with all of this potential, it’s difficult to decipher which company is the best long-term bet in the space.