Truth be told, many boats do not always monitor. In certain areas of the Chesapeake channel 16 is cluttered with constant calls for marina reservations. I wish that the CG would prohibit ship to shore marina calls on 16.
I would want a vhf over an ebirp unless at sea. You can communicate the nature of your problem, receive instructions, communicate with other boats etc and even be located via dsc which automatically is relayed through all surrounding dsc vhf units, which greatly extends the range. Ebirp is only for life threatening situations and I suspect has a much longer response time. Unlike a vhf, none of the boats near you will know of your need.
In addition to my fixed mount I have two hand helds, the batteries last for days.
As I posted before, flares are a pita to use when you have real situation on your hands and do not allow real communication just "maybe there's a boat over there in unknown trouble and probably there's a boat closer by than us that can help." I keep flares for the outdated regs. In all the distress calls i have heard not once did the CG or a towing service ask for flares.
please consider a handheld vhf, the cost is low and you will use it more than you think.