There's room in the world for both designs; it's not really a zero sum game (unless you consider that people designing truly split keyboards would otherwise spend their time designing angled keyboards). Split keyboards can help accommodate people with different body types from yourself. I have a Kinesis Advantage 2 and it is ever so slightly too narrow for what i'd prefer for comfort with regards to my shoulders. When a keyboard is truly split you can adjust each side to be placed where it is best for you.