If its nice and moist in your area, then I would go with sphag simply because it won't dry out as quickly as it does, say here in NYC during the winter. Normally for me, anything in sphag is bone dry 4 hours after I water it. But I keep my masdies in a humid room and the sphag takes a few days to dry. Just water it, let it dry out, but not to the point where its crispy dry. And don't keep it soaking wet all the time. Ventilation should keep your orchids from rotting.
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"We must not look at goblin men,
We must not buy their fruits:
Who knows upon what soil they fed
Their hungry thirsty roots?"
Goblin Market
by Christina Georgina Rossetti
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