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Pete I’ve only been using the 4 finger G chord fingering since I joined this site. Before I always use the folk fingering for the G chords. But it seems to be an easier chord change from G to D and back to g with the 4 finger G. The ring finger is on the B/3 position and the pinky on the E/3, so when I transfer to the D chord fingering I leave the middle finger on B/3( 0r D note) and just reposition the index and the middle finger to G/2 and E/2. This leaves the pinky available to hits the bass note F# on the D string 4th fret. for a fuller sounding D chord. So if I got back to the G chord that ring finger is still on B/3 and makes it easy to reposition the other fingers to complete the G chord position.
For C to D the ring finger is always on the root note and can move up or down from A/3(C chord root) to the D chord root on B/3 down 3 strings. that again makes the C to D an easy transistion. Those are guide finger positions for me.