Jon, with the Gravely (similiar to your front mower machines), I have actually tipped the machine. The ZTR on the same ground just zipped around. Not knowing your landscape and since I don't have a tiltmeter not knowing my landscape in degrees, it is tough to answer your question. I would expect that different brands of ZTR machines would have different characteristics also. Check the tire size, machine weight, and width. Try to demo the machines. As far as the wet ground, my machine will leave lines in the grass, but the wide turf tires haven't left bad ruts. Matter of fact, I was suprised on how turf friendly the machine turned out to be. (I did however get it stuck in the mud and had to have my wife drive it out while I pushed. I sank down to my ankels, no machine could have been used there). I hope that this helps, good luck, Rich.