The underlying satellite communication technology is the same for most products (spider, inReach, etc): it’s the Iridium sat network.
inReach is most suited for the pilot who owns the devise (both commercial pilots and private operators, like the mishap pilot in this case). As it can be carried between aircraft, and the owner’s tracking and messaging activities determine the data cost.
My VAS provider offers different contracts, some where you can activate the service only when you need it (which again makes it affordable for private operators who don’t fly every day).
Spidertrack lends itself to fleet operators and has great fleet management functions. As the fleet operator pays the (sat data) bills, they had to artificially limit the texting feature to “base”. (They found that bored fix wing pilots would text all night with their girl friends - via satellite on company expense...)