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About the only thing I agree with in the comments you’ve gotten so far, @OC. is that it is personal preference. The 4 finger chord doesn’t sound fuller, it doesn’t sound better, it’s not easier in any situation. It simply sounds different. If you are trying to play a song where the original guitarists used the 4 finger G, you won’t get the “right” sound any other way. The Eagles, for instance, used that form of the G major chord a lot. And they used other chord forms that are easier to move to from the 4 finger chord. For instance, the G9. Start with the 4 finger G and move the index and middle down (toward the floor) 2 strings. Try making that chord from the 3 finger G.
The 3 finger G using the middle, ring and pinky is “the best” for being able to make a G7 or a Gmaj7 and going to the C chord or the version of the C chord where you move the index and middle down (toward the floor) one string but leave the pinky and ring where they are.
Obviously, you are going to have to learn several different ways to make a G chord to be a fully rounded guitar player.
MG 😀