I switched from Pycom products to Particle. For me they were not stable (hardware or firmware), were expensive, and had terrible LTE support. The community is pretty stale too. Pycom seems more focused on their PyLife consumer products now. Unless some other bomshell announcement is made, I’m sticking with Particle at least until I have a product that’s selling very well, at which point I may develop my own modules. Particle is still the best and shortest path forward for me at this point.
EDIT: Few other reasons I switched to Particle: No OTA system or user firmware support. Extremely buggy modem firmware. Devices that would simply stop working in the field and not come back online. DOA hardware straight from Pycom, and no response to several inquiries to customer service to get an RMA for them.