so my preliminary findings were that the Jameson 12 has a distinct fruity flavour with a particular sweetness, while the Bushmills 16 has a more cinnamon-ish taste, with some other stuff that I can't quite put my finger on. The Bushmills wins out in smoothness (clearly), but I think I prefer the flavor of the Jameson varieties better.
The regular Jameson was there for quality control.