Normally for primary hybrids, I would observe if the flower exhibit the characteristics of both parents in terms of shape, colour and fragrance. For example, my Van. Kedah Bella here> http://www.rv-orchidworks.com/orchid...dah-bella.html the shape looks like a Rhyncostylis coelestis but yellow in colour. In other words, Vanda vietnamica is dominant in colour. It also inherited the fragrance of Rhyncostylis coelestis. The leaves are slightly bigger than Vanda vietnamica. However, I would be happier if the lip colour to be intense pink/purple instead as there are a lot of photos on the internet look like that (just my personal preference for colour).
Another example, I used to have a Rhyncostylis coelestis X Vanda (Neo.) falcata, which has the big, purplish lip just like Rhyncostylis coelestis. However, it was so slow growing. Normally, Vanda falcata would be dominant in this cross but with improved size of petal and plant but with coloured, narrow lip. Rhyncostylis coelestis made the spur to be shorter.
It is easy to assess this on primary hybrids but would be much more difficult for complex hybrid as the genes are all mixed up.
The answer is yes, you could choose if you can observe the flower of a hybrid and its inverse and it depends on personal preferences. For me I would go for the one that express both side of parents more equally. I definitely 100% will not go for any hybrids that the flower exactly looked like only one of the parent. If I want to buy, it doesn't matter for me whether the plant is (A X B) or (B X A) as long as the flower fit my criteria. But of course I would need to consider the vigor as well while choosing, not solely on pretty flowers that meet my criteria.