What Ham radio brings is the ability to make contact for less-than-life-threatening emergencies... With an inReach or EPIRB, it's pretty much all or nothing. You press the button, trigger an all-out search-and-rescue operation... Sometimes people will delay pressing that button until the situation has worsened significantly. Sometimes it takes an outside view to judge of the severity of the emergency... With radio you can ask questions, bounce ideas, get feedback and advise... And maybe someone will tell you to press that button NOW! I would definitely suggest having both. Not all emergencies are life-threatening, but they all have the potential to evolve in that direction. An EPIRB or inReach won't give any information on the nature of the emergency or your state of mind, though the inReach allows you to send text messages... Hearing someone on the radio can tell a lot about the situation, just from the caller's tone of voice. Even using Morse, you can tell an operator is under stress... Radio could bring you the answers you need so you don't have to wreak havock and solve the issue... Then if that doesn't work, you turn on your EPIRB and hope for the best...
Gil.