I am about to purchase my first ZT. I am leaning towards getting a 2017 Kubota Z125S 54 or a 2017 Gravely Zt HD 60? The Kubota comes with a 25hp Kohler and the Gravely 24hp Kawasaki. Kubota has 4 year/300 hour warranty and Gravely has 3year /unlimited. I will be cutting roughly 5-6 ac. Is anyone...