In my opinion, the big distinction among plastic pots is clear or opaque - color (grey, green, white, etc) doesn't matter (except for your aesthetic sensibilities. Clear pots allow light to hit roots for photosynthesis, and also allow visual checks of the roots and media without disturbing the orchid. The downside of plastic pots is the lack of air-flow and somewhat restricted drainage.
If you use clay / ceramic pots, you can use a plastic pot inside the outer pot to facilitate inspection of the roots, but this eliminates the benefit to the orchid from root photosynthesis. Clay will transfer moisture for more rapid drying, whereas ceramic might as well be glass it is so impermeable. Both are available with single or multiple bottom drains as well as slots or holes on the sides to facilitate aeration.
Another choice are wooden baskets filled with the media of your choice. They are rapid draining and provide excellent aeration, but you can only see roots that have grown out between the slats.
Yet another option is mounting and not using a pot at all. This is closest to the natural growth habit of many orchids, but requires a bit more care and attention to prevent overly dry conditions.
I personally use wooden baskets for about 80% of my orchids. THe rest are about evenly split between decorative ceramic pots with side and bottom drainage, clear plastic pots in clay outer pots, and and directly in clay pots. I am experimenting with a couple of cork mounts. Finally I have several orchids naturalized on trees, but they are very difficult to protect from temperature drops/frost.
The most important thing in YOUR choice of pots is how you want your orchids to look and grow and how much attention you want to give them. My baskets dry out MUCH faster than plastic pots but are nearly impossible to overwater. I have to water more frequently but rarely get any root rot.
Probably much more important than pot choice is media choice. The media, along with the pot (and obviously temperature and humidity), determines how rapidly the orchid will dry, which dictates much of the rest of its care.
I try to buy locally to support local emplyment and merchants. For common items - big box stores, for artsier things garden centers.
Good luck and many more spikes
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