While I don't have comments on your specific machines, I can tell you about my own experiences on our farm that is roughly 100 acres of cultivated land and another hundred acres of wooded land. All of it is hilly.
After renting a few machines in the 8-12 ton sizes, we got a Kobelco SK135SRLC that has some cosmetic issues but just 1450 hours. On our farm we have some wooded areas with roads which seemed reasonably wide for a farm truck but felt pretty tight with a 12 ton excavator. If you have to turn the machine much without jump turning, formerly peaceful and natural areas can look pretty ravaged in a hurry. The near zero clearance helps a lot but I have folded over a few mirrors. I have had to discipline myself toward removing more side-to-side obstructions for clearer passage ways and work areas. If everything were more open, I might have preferred a larger machine for stumping purposes but I am getting better at turning stumps out of the ground now.
Our machine has a manual, wedge-lock quick change and came with a 60 inch cleanout bucket in addition to the standard dig bucket. I really like the cleanout bucket for helping me to do work that is tidier than I would expect for my skill level. By keeping the bottom of that big bucket flat to the ground, the down force is spread out some and I can get things pretty smooth.
The machine has a progressive link, hydraulic thumb and I wouldn't have looked at a general purpose farm machine without one. Great for moving things, snapping (carefully) 30-40 foot alders into shorter, more convenient lengths, and other tasks too.
I had sort of hoped to get a machine with a blade because we have slopes and lots of times I find myself needing to level the machine for some heavier work but I don't want to tear things up/spend time building a level platform for 15 minutes of work. The blade can level the machine right now.
We cave a compact tractor with a 4-in-1 bucket and it does a terrific job of lifting out fence posts. You can throw them in the bucket and it covers ground way faster than the excavator. I worry some about what I am doing to the undercarriage when I have to walk the machine pretty long distances (1/2 - 3/4 mile) routinely.
Good luck finding a good machine. There is so much these machines can do/help with on a farm.