One in the left has larger flowers with fuller petals and nice overall shape. The one in the right has smaller flowers and the petals are swept-back, making them rather poor looking.
However, the former is odorless while the latter has nice fruity scent.
papayj --- know what you mean! Appeal is a eye-of-beholder thing. A healthy orchid and flower can be defined as good health. But appearance is eye-of-beholder.
I know that certain flowers I find more appealing than others (colour, shape, pattern, physical features) may be differently viewed from the perspective of somebody else. That's just 'appeal' factor only (maybe coming from our human side of things ----- or society driven) though hahaha. We love all orchids!