The best part about watering sphagnum moss is that moss weighs almost nothing when dry. That makes it incredibly easy to tell exactly how much water is in the pot. Much more so than bark.
Unlike bark, firmly packed moss moss wicks moisture so well that surface dryness usually indicates the rest of the moss is almost dry as well.
I don't even feel the need to use clear pots with moss, although it is still nice to have them.