I use plastic or clay depending on the plant, the size, etc (some orchids like to dry out more quickly; large pots dry more slowly than small ones) - I can't pay shipping costs anymore for any orchid pots (clear or otherwise), so I use regular plastic nursery pots a lot, or for clay, azalea pots (shallower than standard clay pots)
I love being able to see the roots, but, oh well ... And the clear pots usually end up coated with algae inside anyway, and then you can't see the roots anymore. I use skewers in the media to judge when to water, even if potted in a clear pot - I have learned that in low humidity, the pot (media) can look dry when it isn't.
I do have orchids potted in plastic pots that are prone to blowing, or getting knocked, over - they get set into clay or ceramic pots.
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