As someone with both a sat phone and an etrex gps, you'll be able to guess what my answer will be.....
Etrex works fine, even if the display of lat/longs is a bit small. Most of the time you're just looking at where the arrow is pointing and that is large enough to see.
Sat phones are useful for times other than an emergency. If you're away for a long time you might well want to call 'home' a few times. Doing so on your own terms, in your own space is often nicer and can be cheaper than going through a telephone shop. Phoning out of one of these in Niger, for example, can break the bank pretty quickly.
Also, people can phone (text) you if you have your own phone.
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