I need to inform Urssaf of a house move between departments. I am going to try and use Urssaf directly. However, I thought I would do some prereading of the forum first and going through forum posts I see people recommending a variety of different websites. I have often wondered why there are so many official looking AE sites? Does anyone know if one is better than another? I have used Guichet Entreprise and URSSAF, but I also see posts on Net Entreprise and Portail Auto-entrepreneur to name but two.