I’d call a high-angle stroke powerful, but not efficient. When sea kayaking, I want to keep my shoulders as low and as relaxed as possible and that’s easier with a longer paddle. Likewise, I like a smaller blade – the large surface of a blade only helps for the first few strokes. After that, a much smaller blade propels you just as well.
But I’m on flat and flattish water. I want a stroke I can do for hours and I’m using a 210-, 215-, even a 220-cm paddle. If you’re in real white water, you sometimes need to dig in deep, close, and pull hard on every stroke. Then a shorter, larger-blade paddle is preferred.