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The truth? You want to do both. Every guitar player, as they make advancement, ends up learning several ways to play the same chord. And there are many reasons to play both ways. @Michael-K73 already mentioned using your pinky to fret other notes when playing open chords. Well, you can fret different notes with the index if you use your middle, ring and pinky for the open chords. The better your fretting hand gets, the less difference it makes how you fret any given chord. What will matter is what is best for the song/ progression your playing. 😃