Depends. Myself I play nearly exclusively with my thumb over the neck when standing, except for things that require otherwise. Obviously, when playing stuff with lots of barrechords and stretchy things I keep my guitar higher, for power chord bashing and soloing I keep it as low as I can (my right shoulder doesn't like the guitar being at stomach-height or higher). When sitting I vary it, depending on which is more comfortable, but my most common rule is: for open chords, thumb over neck, for anything else, thumb behind neck.
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