Just to add another company in an already crowded field of compact tractor manufacturers Bad Boy mowers is coming out with a compact and sub compact machine made by kukje in 2021.
I have hilly terrain as well, and unless my FEL bucket is full, I back up the steepest parts. With loaded tires and a backhoe often attached, I keep the weight uphill, and go slowly.
In terms of Kioti vs Bobcat, as far as I can tell from my research the Bobcat is a re-branded Kioti but a touch less pricey. I plan to reach out to my area dealer to see what they may have in-stock. Really pushing for the CT4045.
Its a different kind of tractor but VERY capable on slopes. Previous owner of my land flipped 3 different pieces of equipment - two tractors and a walk behind. I get nervous on that same hill but have never come close to flipping a Ventrac. I have slid on dewy grass though even with 8 tires.
I mow and use the bucket with a grapple to pick up and move wood. Also use rake on driveway and to push wood. Blower to clean very long driveway of leaves.