I have a large shade tree, not shade cloth, but I would think the darker the better, unless you can find cloth that has better UV resistance or durability in a lighter color.
Barb (RVM18), Sena (capuchin monkey, RVM Head Mascot) & Lily (Maltese/Yorkie)
2011 Shasta Cynara 230F & 2012 Smart Car toad, 272 watt solar system
The Journey is Our Destination. Full-timing since 5/18/2011 and loving it.