I love all 3 species. Beautiful. The sobralia chrysostoma is OUTSTANDING. Sadly, not seen much in the USA. I have a Sobralia powellii (or at least it is one of the related species with white flowers) but it is no where near as full a flower.
The other problem is most white flowered Sobralia in the USA are not correctly identified. Sadly Eric Christiansen is no longer with us.