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Your question as the the best potting medium usually gets a 100 different answers.
The simple answer is orchids will grow in and on just about anything.
Sphag and bark are among the most common, just different. Bark is probably the most popular because it is loose and drains easily. It allows good air circulation and allows the roots to dry out. It is good for Cattleya, Dendrobium and other types that like to dryout. Sphag holds more water and therefor needs to be watered less often. It can be used with Cattleya etc that like drying if you water less.
Many members of the forum do not like moss. If a person is heavy handed with watering the moisture retention of moss can cause rotting, especially when grown in a home where drying is slower and the temptation to water to often is great.
Myself and most other commercial growers like moss for Phals and Slippers. Since these plants do not like to dry out, moss is a good choose.
So the conclusion is that the best medium is the one that matches your watering habits and the needs of the orchid.
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jerry
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