It might be interesting to see the dilemma posed to an Enchanter who may have had the good fortune to acquire the Seer's Intuition, Rank 3, but only have Voice of Intuition, Rank 1. The single cast would be a distinct improvement over mana regeneration, but the convenience of the group version would be hard to overlook, especially if the Enchanter needs to recast in the middle of a fight.
Or does getting Rank 3 in one version improve the other?