That's a hard question.
I think those who know the story behind the Moisin-Nagant would gravitate towards the Finnish gun, and would be willing to pay more money for it.
As a general rule the Finnish guns I've worked with have been a lot more refined and a lot more accurate because of the work that the Finns put into them.
For a straight collector, it would probably be the matching Soviet gun simply because the numbers match.
I personally would pick the Finn gun.