Sue, If you hang around here you'll find great folks that are always willing to spend your money:laughing:
Also, oft opined, "Bigger is always better"
Your list of chores doesn't indicate anything that the BX can't handle nicely. If your Zero Turn can make it through, ground clearance certainly won't be a problem. The BX will indeed be the most nimble in the barn. The
BX2350 will handle a post hole digger although it might take a shorter auger than the
B2620.
As for the
B2320, a local dealer described it as a "BX with big wheels" (his words, not mine) The loader performance of the
B2320 and the
BX2360 are almost identical. The horsepower is the same. Although the
B2320 has a larger displacement engine than the
BX2360, the gearing is such that the power output is the same. Horsepower is horsepower. The weights of the tractors are very close to the same.
The
B2620 has 3 more horsepower. That might let you use a slightly larger rotary cutter. You said both are rated for the same size, so maybe not. The loader has more lift capacity if that's important to you. The Bs have a 3 speed transmission instead of the BX's 2 speed.
I have a
BX24 which is essentially the same tractor as the
BX2360 except mine is older and has the back hoe. It's mechanically the same. It works just fine and I have no desire for a larger machine.
Best is drive the candidiates around until you reach your own decision. Your money, your property, your chores and your tractor. All are great machines. Once you decide, never look back!