As said, whatever you like and what is within the price range, just have it sent as a test object. Most of them also come in 30X30 floor tiles, which are completely sufficient for this purpose. It must be untreated and then tested with the usual culprits (coffee, tea, wine, vinegar, lemon).
If the test goes well, everything else is just a matter of price and taste.
So wood in any form is out of the running?