Most often, the need for a sharp turn is not needed on grass or it's grass that you don't care about, like mine at end of a garden row. Even on ZTs, you don't want to do sharp turns because they will tear up the grass.
I would stay away from the GR unless you know you are going to keep it for 20 years. The resale market is not nearly as strong as the BX lineup or similar from other makes. Messisks have a video about the death of the garden tractor. Only reason I still have one is that it is older and I can't afford a used BX as the prices are crazy. I enjoyed mowing when I had the BX but I couldn't justify keeping it when I went bigger.