I prefer the new style. Your eyes will adjust over time. The larger rear U may be faster for acquisition but you sacrifice accuracy at distance, unless you get a large enough width front sight that it then obscures the entire A zone at 15-25. I think for most the eyes will adjust and you will appreciate the accuracy more over the long term but thats just my 2 cents. I have went back and forth from multiple width U notches and fron sight widths over the last 10 years and have come to favor the more narrow front and more narrow rear.