Surprisingly, the toilet wins.
I have argued for years the water saving toilets are a waste because all too often they demand double flushes - wish I could find research to support this.
I believe there is a market for a strong flush toilet to alleviate the frustration of an insufficient flush.
Saving water is a big saving for a family or a business. I spend 20 years setting utility rates and my staff fielded the questions for the high water usage billing.
The planting of sod requires special care - never run an outside sprinkler during high winds or during the heat of the day.