PLBs are a great piece of emergency gear. Nothing does what they do (summon help to your location in an emergency) as well or as reliably. Satellite phones are not as durable, waterproof, or as easy to use. My three year old could summon help with my PLB. PLBs cost less than Satellite phones and do not have any ongoing costs such as subscriptions. I reccomend getting one with a built in GPS.
That being said I would still like to have a Satellite phone in addition to my PLB. They can be used for many other things such as getting weather brieings and closing flight plans that a PLB can not. If you do get a Satellite phone I reccomend getting an Iridium one and not a Globalstar. Globalstar has been having serious issues with their satellites recently and are now very unreliable. I have a friend that had a medical emergency and could never get through the menu selections and to a person before the call was dropped. Luckily, someone else in the party had an Iridium phone.
I have a company that sells aviation survival gear and have offered all BCP members a discount on PLBs. Here is a link to the
post with the details. I currently have both the AeroFix and MicroFix in stock.