The bottom one looks different. Like I said, I can tell once the FPS gets into the teens. The top two look exactly the same to me. I realize they are different, but I can't see it.
This is better, because we're talking about the lower range right now anyway.
That said, I think the difference between 144Hz and 72Hz is a lot more subtle and can't be seen if you try to glance at them directly. Try viewing them with peripheral vision and there's a difference in smoothness. That shows up in things like moving a window around (or even just moving a mouse). It makes a huge difference in input latency/response, but the difference can't be seen easily by just staring directly at a moving image.
Wow! I can easily see the difference between 120 Hz and 60 Hz. 30 Hz (bottom one) looks absolutely horrible to me. I guess there is a large gap between how various people perceive the world.
