You don't mention type of grass you are cutting - lawn, fields, pastures, etc... You are asking the right question and I can definitely give you some good advice! We have a 30-acre horse property in eastern TN - all grass in 7 different pastures plus grazing track and large lawn. I have an ABI 6' finishing mower for my Kubota tractor and a Skag 61" Turf Tiger2 zero-turn mower. For the first couple of years I used the finishing mower for the pastures and the Skag for the lawn - non-pasture areas. It became apparent to me that I can mow much more quickly with the Skag - even being 1' less cut width - plus the Skag can cut as high as 6-1/4" which is great for the horse pastures! I can mow 1-acre in less than 1hr. It takes me about 3-1/2hrs to mow my 5.5acre pasture as long as I don't have to backcut it because it got too tall. We have nice, thick pasture and lawn grass and if you have same - make sure you go with a nice powerful zero-turn like the Skag Turf Tiger2. That thing is a beast and powers through rough pasture grasses in late summer like butter! I hope this helps