How does wood hardness affect the sound of a TT on a wood TT platform?

Hardness of wood is related to stiffness which is useful in resisting bending forces, I.e., isolating against rotational forces. Hardness is also an important characteristic of the cones the wood board should be resting on.

Elizabeth thanks for all that information on Butcher Block. My TT sits on a heavy 3 shelf MDF audio rack w/metal screw in poles. The feet are spiked . The floor is carpeting w/a cement base. My neighbor is the Apartment Laundry Room. There seems to be some inaudible vibration as some of my throw carpets over time move around. Both the TT and the Luxman 38 Tube preamp are a shade on the warm side. I think the Bryston 2.5 SST2 balances that out w/a neutral sound. Right now I'm looking at the Edge cut Maple and Walnut. The TT is fairly big so I will go for the 19"x16"x3" block. Just need to decide as to what feet to put on. 

@geoffkait OP might need springs with that vibration which changes everything!

I’ve shocked enough monkeys for one day, I suspect. 🙉 🙈 🙊

The most vibrationally sensitive device in the world is suspended on glass strings, so to speak.

Any guesses as to what device it is?