Hi @NasGeo,
Welcome to our community!
Reach RX is an RTK rover designed to work with NTRIP services or a single base. It’s easy to use, compact and lightweight – an optimal choice for surveying in areas with good cell and NTRIP coverage.
Reach RS2+ is a more versatile receiver. It can act as a base and rover and record a raw data for post-processing. A pair of Reach RS2+ can operate in remote areas using the built-in LoRa radios.
I’m pretty sure that this post should answer to most of your questions. But if some of them remain, feel free to ask!