My sister will only eat center/edgeless brownies and pieces of cake, which might be cute when you're a kid, but starts to look a bit more obnoxious when you're in your 50s. I'm pretty indifferent, to be honest.
I'm pretty indifferent as well. As long as the edges aren't burnt it doesn't matter where the piece comes from for me.
I'm an edger, corners are prime. That being said if the brownies are homemade (the bakers chocolate box recipe works well) then they're all good.