ASV, and Deere probably have the best slope performance of the skidsteers, but my recollection is that they top out at a 3:1, or 18 degrees for recommended use. While you might get away with steeper, they have two issues; one tipping, and two oil starvation on the engines. Slopes are not the strength of skidsteers. It is a great way to burn up an engine in my opinion.
The 1850 is a 45 degree rated machine. Completely different class in my opinion.
Different machines for different purposes.
All the best,
Peter