I have a ZT and use it in my pastures with the deck fully raised. I get 6 inches of clearance. I love it and use it extensively in my pastures. It has a 60 inch deck,but can go so fast I halved my mowing time.
i have a belly/finish mower for my JD 3020 I used to use at the 6 inch position. It was just too heavy to use for my farm, as it tore things up if the ground wasn’t dry. I have clay, though, which I am sure matters. I am getting ready to sell it because with a ZT and a Brush hog, I can handle whatever I need.
i bought a Bad Boy prof grade. It was half the price of a JD, and is very, very tough. I am ruthless and will mow anything smaller than a tree, and it humors me well. The frame of this thing is comparable to any of the pricey brands.
One thing I will say, but something that you have a local repair person for. I live 1/2 mile from a JD dealer and can drive my tractor there. But I bought the Bad Boy in part because the guy I use to help me with everything farm has exactly the same mower and is thus able to fix mine easily when something goes wrong. There isn’t any learning curve to it when he knows it inside out already. Saves me time and money. He owns a landscaping business and is very happy with the Bad Boy.