Coincidentally, I just made my wife some book shelves in red oak, mostly as a ploy so I could use her marble board to flatten a couple pieces of African Blackwood.
I don't think the red oak is a good choice for scales.
If you look on the Bell Forest products site, you can list all species. They have pictures and data for each type of wood. You will see for example that African Blackwood is about twice the density, and triple the hardness of red oak.
Some things you can't gather from the data however. I bought a piece of purple heart and in addition to fading to a boring brown color, it doesn't take nearly as nice a finish as African Blackwood or Kingwood.