I'm a back-ups to my back-ups kinda guy. Were I to go for a walk on Mt Hood I'd take the MLU, my Garmin Geko 301 (baro altimeter), cell phone and a PLB if DR can arrange an attractive group buy. Add up the weight of all that and it's still not that much additional weight. With any luck the guys monitoring the PLB will call my cell phone to check, and I'll give them a current position and elevation off my GPS smile Don't get stuck on either/or questions. If you have the $$$ to buy a PLB, $5 for an MLU rental is buried in the noise.
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Better is the Enemy of Good Enough.
Okay, what’s your point??