I've never been a fan of waterstones. I don't like the mess they make and the fact that they wear. My sharpening has always been with the soft (grey) and hard (white) Arkansas stones that I've had for many years.
That said, I've been wanting to try one again mostly for sharpening knives. I would also suppliment the oil stones for plane irons and chisels if it makes sense to do that.
So, if you were going to own just one waterstone, what would it be?
TIA