For me they are pretty much the same thing. So, if it were me I would look at cost/ availability of reloading components, mostly brass.
How easily can the Norma brass be bought or found? The Lapua is very common and the brass is every where for reasonable prices.
I have fallen into this trap. I bought a 338 Edge barrel off the EE, thinking it would be great to have Lapua ballistics but build it on a standard Savage action.
Well the cost and more so the lack of availability of RUM brass has made me seriously wish I had just bought a savage in the Lapua version instead.
I completely understand that desire to have something that is different or unique. I tend to try to avoid doing the same thing as everyone else as well.
Go Lapua Improved, its almost the same, but different. Not to mention faster.