Forget the HBF customer satisfaction surveys, star rating and even NHBC awards won.
This forum gives a good indication of who build the better quality new homes.
If you look at the total posts and total topics for each house builder, one builder has far more posts (complaints) than any other:
PERSIMMON HOMES - 150 topics 564 posts
in comparison (by a similar number of homes built each year)
Taylor Wimpey have a combined (both companies) 42 topics 269 posts
Barratt 9 topics and 24 posts.