For one project I have used the Particle Photon, an IoT device similar to Arduino, and am considering changing to a different device for another project (a motion detector that has its own question). I can't find the difference between Particle products such as Photon, Argon, Xenon, and Boron; only that the Boron serves for mesh networks.
Are they just newer versions, like Raspberry Pi 2, 3, and 4? Or do they have different purposes?