I've had both wood and fiberglass. With wood, avoid taking it down unless you have to. Glass bedding is a good idea, too. Avoid too many field strips and a wood stock will do all you ever want it to do. That's what I have on my LRB.
As to the selector, that's going to be a fake one (only the most utterly rare SAI's were built without the necessary tab). I have one to fill in the hole on mine. Rumor has it that those can cause you to be stopped at a range but I've never seen the problem.
In any case, were I to go synthetic, I'd get a USGI fiberglass. But, mine shoots well with the Walnut that is what I use (the birch ones are outstanding, too).