I bought the nicer one. As a WiFi hotspot, the only difference I see in the specs is that the nicer one supports up to 15 devices and the cheaper one somewhat fewer.
The nicer one has a bigger battery and a USB C port. The implications of the USB C port are that it can charge that way, but it can also serve as a power bank to charge your phone. You can also connect it up to a laptop and tether without WiFi, or hook up a mass storage device and serve the data on it out over the WiFi connection. I'm not sure how many (if any) of these activities the cheaper one allows.