The lighter one is absolutely a mistake. The white letters on the light orange background will be almost impossible for some to read. Not everyone has great vision. In any event, the type size of the white letters is too small. If they get frustrated, they just hit the back button. Why drive them away? What you are saying to them is, "if its tough to read, just leave". Is that what you want?
it is better in both of them. I like it better because this color is my favorite color. http://is.gd/cio3X