It depends. If your climate/the conditions in your greenhouse are warm all year with good ventilation, there will be no problem. But if your winter is cool and humid, the Sphagnum might become soggy and kill your roots. As a rule of thumb: cold + wet = plant is dead.
And if you decide to use bark, I highly recommend buying already prepared bark. Doing that yourself will be way too much work to keep up with.
Lastly, your customers might appreciate an orchid potted in bark. The watering in bark is more intuitive and you are less prone to overwater.
Edit: seedlings and young plants perform a lot better in Sphagnum
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Hybrid Mode
