For next year I want to purchase a 52" in either a exmark or gravely. Does anyone have knowledge of both and advantages of either one. Most in my location use the exmark brand. I have been using the small gravely 34z with the 15hp kaw for the residentals. Good mower, but no size for a big yard. There must be a good reason for all the exmarks? I do not mind spending the $$, but I want to make one buy that will do the job. thanks for any help!