Test drove grasshopper front mount with chevron tires and several ferris models with turf tires today on a hill they had at the shop varying from 20-25 degrees (checked with my phone app). It was wet, muddy, and soft. The grasshopper was a bit better on down slopes and side slopes but struggled for traction going uphill. The new Ferris 800 did everything but it was a little light on the front end and the front did lift a tad once going uphill. The 2100 and 3200 had no issues whatsoever no matter what angle I chose. I was impressed. The 3200 is one heck of a machine overall and ridiculously comfortable. I felt the most confident on that to be honest. In dry conditions I am pretty confident they would perform even better. The grasshopper and ferris 2100 and higher models are great options on hills.
All of that said, I'm right back at an expensive option. I got what I think are competitive offers on all of them but I think I am going to see what I can find used as I am not sure I want to spend that much.