I have looked at both these towns/villages. We too are movers from the south. We've actually gone with farington moss as better links for work.
We looked at new builds a while back and found Miller superior, but the development at farington is much bigger.
Tarleton is very handy for southport, but check flood risk on the houses there as they are close to the river.
There is also a new build development down the road in Rufford, which I think are lovely houses.