There is a rule of thumb that says the size of the medium parallels the size of the roots, so a fine bark for fine roots, chunkier bark for thicker roots. However, an orchid will grow on most anything if you adjust your watering practices to provide what the orchid needs.
Big chunks are a poor choice for an orchid that wants to stay moist all the time, fine bark is not so good for a plant that needs to dry out between waterings. Good culture information will be your guide, along with your own experience.
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