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Davey,
I think you'll find it's case dependant.
Example - your spg goes fizz bang and disappears off into the blue. In this case as you know the guage is run by the primary post, all you need do is shut that, switch to backup and go....
BUT, here's the ring twitcher....
BANG! You are surrounded by a cloud of bubbles and something behind you has gone.... But what? Primary inflator hose, secondary reg hose, tank o-ring or what? If you shut A.N. Other post down how do you know (apart from the abatement in noise and bubbles) tghat you got it right? What d'you do if you got it wrong? You could now have no air supply until you switch that post back on and then isolate the other - major loss of time and gas.
Basically, if it's immediately obvious then you can save time and brownies by going for the duff post. If not, go for the failsafe and shut the mannie to at least save half your gas....
Then again, it could be a stage.......
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