Bryophyllum Question

I got a large plant at a garage sale that they told me was called Donkey's Ear. I've found some information but I can't seem to find anything on potting medium. It definitely needs to be in a larger pot since it is in a small one, a 4" plastic, and the plant is probably 2 - 3 feet tall. The question is what would be best to use to pot it in? Plastic or clay? And what sort of medium?
Any help is appreciated
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