I was short on time with my 1st post and kept it brief. I voted synthetic on this rifle for several reasons.
#1 a Tikka is always going to be a workhorse rifle, not a showhorse. The best looking wood in the world ain't gonna make it pretty.
#2 Synthetics will always be stronger, more stable and much more consistent in accuracy. Not necessarily more accurate, but your groups won't wander around requiring you to re-zero your rifle like you will with wood.
#3 The biggest appeal of the Tikka is the light weight. Why saddle it with a heavier wood stock, especially a MUCH heavier laminated stock. If you want a heavy rifle buy a Weatherby Vanguard. They are nearly 2 lbs heavier, cheaper and will likely be just as accurate.
Yes the recoil will be a bit worse, but the stock design and recoil pad play just as big a part in taming recoil as the weight. The Tikka stock is a good design and with a Limbsaver pad recoil will be tolerable.