If your budget fits both, might as well have both ;-) I would actually like to eventually get a "BX" sized tractor for the wife.
But I love my ZTR and wouldn't want to give it up. Each of us have our own unique "land" situation, but personally I wouldn't want to mow with anything else.
If you have other tractor brands around, shop them too. JD, Kioti, Mahindra, and LS all make SCUT's, and each one has advantages over the other. The LS version has a stronger loader than the others if I remember correctly. The Kioti can be had with a factory backhoe (the others might too, but I'm not sure).
There's a tractor out there for every need, but I still wouldn't want to ditch the ZTR unless I had to.