There are of course objective standards such as weight, economics, ease, performance, sound, availability or accessibility, smell, and even looks to name those that come quickly to mind, but it is in the way that each of us prioritize and weight those standards.

Fortunately we all do that differently, otherwise we would all have clamored to win the hand of the same lady and the flying field would be a dull place with everyone flying the same craft.

There is no right or wrong to the order or weight that is given to the standards... there is only wrong when one or more of the standards are totally ignored.