Personally, I think this is a complicated question.
Some people prefer sumo others regular because it works for them. So, to a person who is all about high weight low reps = growth it would be whichever form allows them to lift the heaviest. To the person who is about low weight high reps gimme a burn = growth then they'll like whichever form allows them to get the biggest pump.
I personally like the heavy weight and I take a sumo stance. It's way easier on my joints and I feel it all over my back when I can go heavy. If I go too light, I only feel it in my lower back.