I'm a bit of a newbie to the orchid world, but I've been using clay pots mostly (though I do have a few plastic ones) for a few reasons.
1.) I prefer the way the clay pots look compared to plastic.
2.) I grow with sphagnum mostly and the combination of clay/sphag dries out in my preferred time frame.
3.) I grow a few of my phals at a slant and the plastic pots would topple over off my window sill when they started drying a little.
4.) It gets very hot in my room (many days were in the triple digits this summer) and the AC is on the other side of my apt. The clay pots seem to keep the roots cooler than plastic (esp. black/green plastic).
5.) Low humidity often here, the clay pots and saucers seem to raise the local humidity as the water evaporates.
6.) Clay breathes unlike plastic (not including net pots) and I've heard that the roots like that.
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