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...