Woodstone and Summit are each 1 in 4, so yes you can go to Woodstone one year and Summit the next.
Personally I prefer Summit since I like to be up the mountain, but the units themselves are both very nice. When I am at Woodstone it just feels more like I am in a "town", but when I am at Summit they seem more spread out. My favorite so far has been Summit Hillside, then the Mountainside Villas