Both colors do look great but I like Cactus better!

I agree with Bev. Both colors do look great but the Cactus provides more of a contrast against the light stone, white trim and shutters.

I think the roof looks pinkish, and therefore doesn't work well with either color.

I don't care for either color. Take a look at Benjamin Moore kitty gray 1589.

Both colours are ideal however I think there are hints of Sierra Rustic on the stone siding material and roof as well additionally, it's an earthy tone that compliments the shades of nature like the greens from the trees and browns from the trunks and stems.

Since you didn't give an option for "none of those" or "something else" I guess Cactus, but....meh.

Both are nice but the lighter one would look better at night.