All of the manufacturers I have listed have stuff that has been around for a while and if you speak to the distribution chain in your area then they will normally tell you at least that the product will be supported for the next 5 - 10 years etc.
The smallest are between Cinterion and Ublox, then Telit then Quectel from memory, or it was when I was looking, Cinterion and Ublox have similar power consumption.
SIMCOM stuff has been around a while, but sometimes procurement can be an issue, again, depends on your distribution line.