I'm siding with Gary. I think the NAS is much better than the 12 yr. More flavor and balance. The NAS Jameson has improved significantly in recent years.
More flavour? Really? I must have got an off-bottle, because mine had hardly any flavour at all to speak of...
I am not sure why some people feel that the NAS has more flavor than the 12 year. In my opinion, it is not even close. The 12 is much more complex than the NAS stuff.