If they're still armament sailors, the dual 3.9" or 5" NLD. Be aware that the limited space (especially T-slots) on some ships limits your options.
If they're already AA gunners, it's probably worth rolling up a second set to class late. In the mean time, the dual 3.9" A has a good rate of fire and okay damage (if meh range). It also has the advantage of being tiny (less space than the dual 4.7"), and an actual dual purpose gun (consider especially if you're taking a Kongo or Asama to blitz)
If your AA gunners are sufficiently BVE'd to produce useful spread, just go with the 4.7s. The range is remarkably useful.
The dual 3" A is more of a toy than anything else. But sufficiently pom-pom like to be amusing at times.
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