That is a gorgeous vanda. I just ordered Vanda Steven Scott Young from Motes. All my Vanda's seem to be purple.
I always suggest that beginning orchidists use clear plastic so that they can monitor the heatlth of their plants. By the time you see the damage on the top, the roots are toast.
After gaining proficiency, its a matter of choice. If you are growing in a dry climate and on your window sill, the plastic would be better.
I use terra cotta because my greenhouse is often like a steamy swamp and I want the orchids to dry out faster.
Daisy