Red Oak will break with any contact work.
White Oak or Hickory should last you many years.
I bought some Ebony weapons from Artha Gallery and the pricing (on a wholesale order) was close enough to the White Oak that I use it now. They will all get 'dinged up' with contact. The Ebony is beautiful, and a little heavier/denser than the white oak.
I have VERY limited experience with a Katana, but the ebony feels much closer to a live blade than the white oak does.
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