Hi 70cst. It sounds like we have similar yards; mine is one acre, sloped, and several trees to mow around. I have a
G1900 and recently acquired a
BX1860. I haven't used a GR, but my
G1900 is similar except it doesn't have 4wd. The BX does mow nicely and would be perfectly fine as a primary mower. It is heavier and a little more "tipsy," but unless you have very steep hills to mow I think it would be just fine.
If you only plan to mow and maybe move snow I would go with the GR. However, if you think you might want to do any implement work (who can't think of a list of projects for a front end loader?!) the BX will mow basically just as good while still being able to accommodate implements.
For what it's worth, I planned to sell the
G1900 and use the BX but am now thinking I will keep both. I could do it all with the BX, but I really like zipping around quickly on the
G1900. Still, if I had to commit to only one machine it would be the BX hands-down.