In addition to the above, the hydraulics work at idle and less noisy hydrostat on the later 25 series. Definatly test the hydraulics @ idle and higher, and drive both, switching between forward and reverse. This way you absolutely know what you are getting and won't have any complaints. Personally I would like the 25 better but depending on the actual units that you are looking at and the price point of the deal you might be also happy with the 24.