I live in a Taylor Wimpey, my second, and have also lived in a Bryant (as was) and Barratt. While the Barratt was the best and came with a 5 year warranty, none have been amazing and none terrible.
I currently live on an estate with two medium sized house builders as well as Wimpey, but I believe who only have sites in the Midlands. Generally the feedback is higher quality materials but reflected in the higher price. You can see with Wimpey's that every possible cost saving has been taken.
One important thing to note is you should be able to get 5% in incentives if you are not p/x ing. Not usually a discount, but often deposit paid, free carpets or kitchen upgrades etc.