Pros of the Noble:
The blade has a nice shine to it like the real sword
The metal used is high quality (ACI is very thin and could snap/bend)
The elvish inscription runs up both sides
The handle is a lot thicker meaning the figure can hold it with ease. (the figure struggles to hold the ACI Anduril and Ranger sword as the handles are very thin)
The handle is slightly smaller and looks more in proportion with the figure.
Cons:
The black part of the handle gets fatter at the top which isn't accurate (though you can't tell once it is in the figure's hand)
No gold detailing on the handle
The inscription is printed on and might rub off
It probably doesn't fit in the scabbard as the blade is thicker (I don't want to try and risk scratching it)
Apart from that, I'd say the Noble wins it. It's more accurate with the inscription and shiny blade, figure can hold it with ease, it's in 1/6 scale and does not look oversized.
The ACI is essentially Narsil.
I'd forgotten just how stupidly big the sword is in the film: