Disregard specific manufacturer recommendations, because you're only hearing about what people have in the garage. The big companies have comprable lines and are all reliable machines.
Match the tractor specs with what your're doing:
1. Hilly - look for wide stance preferably something you can reverse the rims and get really wide. Low center of gravity as well.
2. Silty clay with Washington rain -- you've got a mess so make sure you get 4WD with ag tires, preferably filled. And a stick to get the clay out of your treads.
3. Moving rocks, terracing, trails -- you're looking for a work horse not a riding mower. Up the horsepower to the 25-30 range. Yes, to the loader, thought the back hoe will be pricey. If you're terracing includes retaining wall, the hoe is a definite. If you are just shaping the earth, I'd try a rear blade or box blade before spending that kind cabbage.
4. Transmission - the Kioti has a shuttle shift whereas most of the others have hydro-stat for more $$. Now, I have manual, but if I was in the rain, on a hill, with a boulder in my bucket I might not want to be looking down searching for the gear if I didn't have to.
If cost is a factor look at the used market -- get ROPS.