The choice is all your my friend. I have seen both up close and personally I like the non traditional look of the Tikkas. I have 2 in synthetic and love them, accurate as hell and almost never get a cleaning!
The only issue I have with the walnut stock is they actually look cheaper than the synthetic. The stocks are virtually identical and in this case the synthetic looks better. If it was a nice Winchester, Browning Remington piece of walnut, well that's a different story, I, personally would still go with plastic but the choices would be more distinct.
A great gun regardless, enjoy.