as there are many different ways to construt chords how do you know which pattern is the most suitable for different songs
i do it on how easy it would be to get to the next chord.
i always think that my fingering is a little strange (or should i say different) to the other guitarists in my band, even on leads, but whatever works for you.
--------------------i'm definitely the alphaest male here--------------------
Trial and error. Use your ear.

The following are all D-A chord changes:


Which one do you like best? None of them are better than the other, its all up to you.