I like 小人國 more. My daughter also likes it very much (she was 6) because there are more rides suitable for kids.
You can also take a lot of photos in all those mini countries. :)
It was very quiet when we were there so we could play the rides for many times.
We didn't go to 六福村 with our daughter but 六福莊. (my husband and I have been to 六福村 in the past and didn't really like it)