[Cynthia, Prescott, AZ]

I prefer plastic because the pot can be flexed to release the roots from the pot with zero damage. Orchid pots with the slit sides are the opposite for damage to roots when repotting as the roots coming out the holes are a total loss at repotting time. Getting a plant out of a clay or glazed pot generally requires using a sharp sterile knife to run around the inside of the pot to free up the roots.