Thanks Kim and Roy !
Roy, the lip of Vanda insignis is also pink and its shape can not be clearly seen in this photo, that's why it can be confusing. But a close look of the lip clearly shows that it is a Vanda bensonii.
The lip of Vanda bensonii has a "T" like shape and is arched at the apex.
The lip of Vanda insignis is very broad, flat and usually upcurved at the tip and looks like the blade of a shovel. If you water the flower, it remains inside the lip...
Flowers of V. bensonii are a bit smaller than flowers of V. insignis.
Both are medium size plants but leaves of Vanda bensonii are coriaceous and those of Vanda insignis are much more ligulate.
Please take a look at those photos to compare lips of V. insignis and V. bensonii. I also attach a lighter and yellowish form of Vanda bensonii. Usually on the yellowish forms of Vanda bensonii, the pink color of the lip is lighter than on the darker ones.
Hope it will help
!
Lip of V. bensonii :
Lip of V. insignis :
An another form of V. bensonii :