Green homes: rainwater harvesting vs. greywater recycling?

Been looking into green home designs lately, and I'm kinda stuck between two water-saving options. Rainwater harvesting seems pretty straightforward—collect rain, store it, use it for gardening or toilets. But greywater recycling (you know, reusing water from showers and laundry) sounds smart too, though maybe a bit more complicated to set up. Anyone here tried either? Curious which you'd pick and why...