I have only sat on a 3520, but to me it seemed like it sat higher, the hood was wider and higher, and the view of the front wheels was less than my 4400. I checked the specs on the John Deere website, but all it told me was that the wheelbase was the same. If you see a 00 or 10 series next to a 20 series, the 20 series looks bigger. I like the size of my 4400, and based on my observations, I am not interested in the 20 series. It looks like the 3203 is more along the lines of the 4400 size. I have a 48" overseeder that I pull, and the previous owner said that a 4300 would barely pull it. So, I would be concerned about losing the 3 hp.