Bernard said,"I also insist on forming G with the 'pinky' on 1st string, third fret, ring finger on 6th string, third fret, and middle finger on 5th string, second fret."

While I don't always force a student to change who already plays another form of G chord, this is how I teach it to beginners and how I most often make it myself. Since G is often followed by G7 on the way to C, it makes this change much easier. I will sometimes use the 320033 fingering as well.

I will often finger a D chord with my ring, bird and pinky if I want to follow it with a D7.