So I bought a new guitar from Guitar Center and I am in love!

While talking to sales guy (who could play well) I was strumming some chords on different guitars and he said "Don't play G like that, play it like this". Then he added my ring finger to B string and my pinky to the high E. He said this is the way muscians play it. It did sound better to me than the way we are taught to play it in the course. It also seems a bit easier because when I'm playing I Get It Now at full speed my pinky sometimes ends up getting in a tangle with my other fingers.

Would it be bad to switch to playing G the way he showed me at this point? Is there a reason why that particular G was selected (hand training reasons or something)?