Also, I'm not sure about the 4030, but I believe the 4.75 cab comes standard with a creeper gear if that's important to you (it is to me).
It would really help if you could list your own preferences in a tractor. As far as capability, I don't think you'll see much difference in the two, and you can probably get a cheaper price on the 4030 than the 4.75. This is all speculation though. As I have never sat in, or got quotes on, either of these tractors.